The Science and Ethics of Age-Gap Attraction: Why Older Men Are Drawn to Younger Women, and Where the Line to Crime Runs

On the reproductive imperatives coded into every testosterone cascade of the male body, on the data from 130 countries that at once confirm and considerably complicate the received story, and on the distance between what biology explains and what it under no circumstances excuses, written by someone who knows from professional experience what that distance looks like once it has been crossed.

This piece was rebuilt from the ground up on 01.07.2026, because I have learned a few things since, and because the previous version no longer carried my own voice, the voice that matters more to me than any polished phrase. Over the past years I have learned to stop hiding my feelings and my judgment behind a neutral facade, and instead to place them exactly where they belong, and that is precisely what happens in this new version.

Anyone who knows me knows that in the early 2000s I worked in a field one does not discuss over dinner, and that this work involved, among other things, the examination of seized computer systems that held material no human being should ever see and that I nonetheless had to see because my profession demanded it. The magnitude I sorted, categorized, and prepared for the courts back then ran, in the case of the photographs, from tens of thousands to well over a hundred thousand, and in the case of the videos across a similar and equally vertiginous range, so that at the end of a working day I carried numbers in my head that would no longer resolve back into images, because at some point the brain shuts a door in order to survive. What I felt in that period was first a helplessness for which I long had no word, that paralyzing sense of sitting across from a horror I could document but not undo, and over this helplessness there very soon settled a deep, physical revulsion and the one question that would not release me, namely how a man can do such a thing and film it on top of that, as though the suffering of a child were an object one keeps on a shelf. I frequently suffered from insomnia during that time, because the images would not switch off once the light went out, and my own sexuality was for long stretches simply no longer available to me, because something in me refused to come anywhere near a thing I could only picture in its monstrous distortion. Whoever has to take that in for a living, and I use that phrase deliberately because there is no gentler one, carries it for the rest of his life, in a corner of the mind that never fully closes again. This piece, however, is about a different subject, one that occupies me from a deeper, older, anthropological layer, and that I wanted to put off for years, because I knew exactly how easily it can be misread.

It concerns a question almost everyone has thought at least once but rarely said out loud, because it leads at once into a moral suspicion that smothers sober examination in the cradle. Why does a 60-year-old man, old enough to know better, who by the standards of social expectation ought long since to have settled with dignity into his age, still turn his head after a 20-year-old, and why does this mechanism run so reliably that one can observe it on any shopping street, in any pedestrian zone, and at the next table of any pizzeria you please. I have decided to treat this question the way I treat every other forensic question, namely coldly, precisely, and without any attempt to bend the result in advance toward a convenient morality, because I am firmly convinced that the truth pays a subject more respect than any soothing lie.

I will say already at this point, where I have not yet cited a single study, and with complete lack of ambiguity, what this piece is about and what it is under no circumstances about. It is about the attraction between adult human beings, about that biological mechanism which orients a mature man toward a young, sexually mature woman, and it is about the question of where the science ends and where the responsibility of the individual begins. It is expressly not about explaining, relativizing, or in any way excusing the abuse of a child, because between the lawful attraction between adults and the crime against a child there lies no sliding transition but a categorical abyss, one I will mark in this text with the same severity with which I encountered it across decades of forensic work. Whoever throws these two things together, mistakes the one for a preliminary stage of the other, or wants to read out of my sober description of the first a leniency toward the second, has either not read this piece or did not want to read it.

The look on the street that everyone knows and no one admits

You see them everywhere, and you see them with a regularity that can no longer be coincidence. The older, good-looking gentleman in the German sports car bearing the crest from Zuffenhausen, beside him a young woman so much younger that an uninvolved observer at first thinks of a father-daughter arrangement, until a gesture, a glance, or a touch corrects that reading and replaces it with another that leaves some onlookers uneasy. You read of prominent men, of actors, musicians, and athletes whose partners or wives are thirty years younger than they are, and you register a quiet social shrug that extends to these men an admiration the same arrangement with the sexes reversed would never receive. The man ages, that is beyond dispute, yet he ages to a surprisingly large degree only on the outside, while deep within, behind the wrinkles and the gray hair and the waning strength, there often still sits the same small boy he was at seventeen, only that this boy has grown more mature, more experienced, and above all more tired.

Added to this is a phenomenon that reaches deeper than any socialization and any upbringing, because it is anchored in the man’s genes and has been at work there for a span of time that eludes the imagination. I want at this point to affront directly and without detour those male moralizers who at this subject reflexively raise their eyebrows and speak of unnaturalness, because I know from long observation that precisely these gentlemen are lying to themselves, to me, and to everyone else the moment they claim their gaze stays entirely unmoved when an attractive twenty-year-old in a skirt whose length one might politely call sparingly measured walks past them and, for the fraction of a second, strips them of the capacity for clear thought. Whoever denies this is lying, and not out of malice but out of that comfortable self-deception which allows a man to place himself morally above a mechanism to which he himself is subject. I write almost every day, whether an expert report, my book, a post here on the blog, or a scientific paper, and I set down, as neutrally as is humanly possible for me, exactly what I know, what I think, and what I feel, and I see no reason to depart from that habit on this subject of all subjects.

I confess openly that I had considerable ethical reservations about writing this piece at all, because I know very well into which corner one is placed the moment one so much as sets foot in this field and calls things by their names. Since I am, however, neutral, must be neutral, and am sincerely indifferent to what other people think of me so long as I remain at peace with my own conscience, I write this piece the way the matter actually stands, and I leave the moral outrage to those who need it.

The algorithm is real, and 130 countries have measured it

Let us begin where the science actually begins, and that is not the court report but one of the most frequently replicated findings in all of cross-cultural psychology, whose robustness even its sharpest critics must by now concede. David Buss recruited in 1989, for a study that has remained a reference point of the field for over three decades, a total of 10,047 participants from 37 cultural samples spread across 33 countries, and against this vast body of data he examined the question of which qualities men and women actually weigh in choosing a partner. The result came out with a clarity rare in the social sciences, for in every single one of these 37 cultures men weighted youth and physical attractiveness more heavily, while women rated a potential partner’s social status and earning capacity more highly, a pattern that across the following 35 years has held up as a finding through replication, extension, and the most intense criticism, even if the interpretation of that finding remains to this day the object of a wholly legitimate scientific debate.

A considerably newer study with an even larger body of data confirmed the directional consistency of this pattern impressively and at the same time made its cultural range visible. Josh Ausubel and his colleagues at the Pew Research Center analyzed data from 130 countries in 2022 and found that in every religious group examined and on every continent examined the men were on average older than their female partners, with the worldwide mean of that gap standing at 4.2 years. The regional scatter around this mean was, however, considerable and decidedly instructive, for while North America with an average gap of 2.2 years and Europe with 2.7 years lay at the lower end of the scale, the countries south of the Sahara recorded values far above that mark. In not a single one of the 130 countries examined were the men on statistical average younger than or the same age as their partners, which underscores the universality of the direction without that universality saying anything about the concrete size of the gap in any particular society.

A study tailored specifically to Europe, by Gottfried and colleagues, which appeared in 2024 in the journal Personal Relationships and drew on the data of 35,996 participants in the Europe-wide SHARE survey, brought a particularly telling dynamic to light. For men the projected age of their preferred partner fell by nearly one year for every five years of life they themselves gained, which in concrete terms means that a 70-year-old man in this sample on average preferred a partner of roughly 58, while a 70-year-old woman in the same dataset chose on average a partner of about 68.5 and thus allowed a far smaller gap downward. Women therefore did show a comparable effect, yet it turned out considerably weaker and stayed anchored consistently closer to their own age, a difference in the direction of the shift that can be documented across several independent datasets and cannot be convincingly explained by social conditioning alone.

These numbers are demographic facts and not ideological postulates, and precisely because they are so inconveniently neutral they call for an explanation that reaches deeper than the comfortable appeal to social conditioning, however real that conditioning may be in the individual case.

How it really was, beyond the comfortable cliche

Anyone who believes the large age gap is a quirk of wealthy old men of the present is mistaken, and anyone who conversely believes that in the past simply every man married a woman thirty years his junior is mistaken just the same, for the historical reality is more tangled and precisely for that reason more interesting than both cliches combined. The demographer John Hajnal described in 1965 a pattern that occupies research to this day, namely an imagined line that ran across Europe from Saint Petersburg to Trieste and divided the continent into two wholly different marriage worlds. West of this line, that is in England, in the Netherlands, in northern France, in parts of Scandinavia and Germany, people married conspicuously late from the sixteenth century onward, the women on average at about 25 and the men at about 26, the gap between spouses stayed small, and a considerable share of the population, up to a third, never married at all. This northwestern European pattern was the exact opposite of what many people today take to be the ancient and natural rule, for it rested on partners of nearly equal age, on an independent household, and on an unusually strong say for the woman by the standards of the time, and it is no invention of modernity but many centuries old.

South and east of this line, however, the world looked entirely different, and precisely this contrast is the point that matters to me here. In fifteenth-century Florence, whose tax register from 1427 gives us, thanks to the meticulous work of David Herlihy and Christiane Klapisch-Zuber, an unusually precise snapshot of an entire society, the women married on average at about 18, while the men did not think of marriage until 28 to 30, which produced an average age gap of 10 to 12 years. In large parts of Eastern Europe people married even earlier and with even larger gaps, and marriage there was nearly universal, permanent singlehood therefore the rare exception. The socially accepted age gap between spouses is accordingly no biological constant but a historically and geographically movable quantity, and this insight cuts in both directions at once, for it pulls the ground out from under the outraged cry of eternal unnaturalness just as much as from under the comfortable claim that it has always been this way anyhow. Where the brides were, however, not 18 but considerably younger, and such arrangements did exist in various cultures and eras, there runs precisely that line whose drawing was the real achievement of civilization, and it is that line the last part of this piece is about.

Trivers, parental investment, and the cold logic of reproduction

The standard evolutionary-biological explanation for this globally measurable pattern takes its start from Robert Trivers and his theory of parental investment from 1972, counted among the most influential works of twentieth-century biology, whose core idea has a compelling, almost uncomfortable clarity. Trivers recognized that the sex which invests more in reproduction, measured in time, in energy, and in biological risk, will necessarily be choosier in selecting a partner, while the sex with the lesser investment must compete more intensely for access to the more heavily investing sex. In humans this asymmetry is especially pronounced and physiologically firmly anchored, because a woman’s reproductive potential is defined by the limited number of her eggs, declines measurably in her early thirties, and ends completely with menopause, whereas a man’s reproductive potential, resting on a continuous production of sperm, diminishes far more slowly and extends considerably further into life, even if the quality of that sperm falls in a clinically demonstrable way with advancing age.

From this fundamental asymmetry evolutionary theory derives the prediction that men, across the deep time of human origins, developed psychological mechanisms tuned to reliable cues of female fertility, and that these cues correlate almost throughout with youth, because a young woman can, from a purely biological standpoint, undergo a faster, safer, and less complicated pregnancy than a woman past forty, whose fertility has already fallen off markedly and whose pregnancies carry statistically higher risks for mother and child. Among the cues to which the male gaze responds, without the man being aware of the process, are clear skin as an indicator of hormonal health, facial symmetry as a correlate of developmental stability, and the ratio of waist to hip as an anatomical hint of reproductive capacity. These are not preferences a man consciously and freely selects, but rather, in the precise language of evolutionary psychology, adaptations, that is, preferences which across the deep time of evolution raised reproductive success often enough to become a characteristic trait of the species.

Kenrick and Keefe confirmed in 1992, in a careful analysis, that male age preferences in actual partner choice, and expressly not in merely stated wishes, remain constantly oriented toward women in the range of highest fertility, and this even as the men themselves grow ever older, while the preferences of women shift with their own age and tend to follow men who are somewhat older but stay relatively close to their own age. This asymmetry in the way the age preferences of the two sexes shift across the lifespan is documented across several independent datasets and cannot plausibly be explained by the social conditioning of any one culture alone, because it turns up in cultures that in almost every other respect have scarcely anything in common.

The serious criticism of this explanatory frame, and it comes tellingly from evolutionary biology itself and not from its ideological opponents, bears not on the existence of the pattern, which is hard to dispute, but on the completeness of the causal story. Modern contraceptives have for roughly seventy years decoupled sex from reproduction in the developed countries, which means that the fertility-tracking mechanisms, insofar as they exist, now generate their preferences in a reproductive environment that no longer resembles in any way the one in which they once evolved. This circumstance matters because an evolutionarily shaped algorithm can, in a wholly new environment, produce suboptimal or even actively harmful outputs while nonetheless remaining a real and deeply anchored feature of human psychology. Whether such an orientation is still appropriate in the Europe of the twenty-first century, where the great majority of these partnerships will produce no children anyway, is a question evolutionary theory cannot in principle answer, because evolutionary theory describes what is and never prescribes what ought to be.

What the brain actually reads, and why it cannot stop

The neurobiological basis of these preferences is by now so well documented that one can no longer in good conscience ignore it, and it begins with testosterone, that primary androgen which acts in the physiology of both sexes, though in dramatically different concentrations, and which is tightly linked to the male orientation toward fertility cues. Studies from the group around James Roney have documented that the testosterone levels of men respond measurably to brief social interactions with women, and that this hormonal reaction is modulated by the perceived attractiveness and age of the women involved, which describes a neuroendocrine feedback loop whose properties are anything but harmless. Testosterone, for one thing, heightens the perception of attractiveness cues, and, for another, is itself further raised by exposure to exactly those cues, so that a system arises which does not correct itself but under the right conditions escalates itself.

The dopamine dimension of this process is of at least equal importance, because it explains why desire possesses so compelling, so nearly physically inescapable a quality. Exposure to an attractive young person activates the ventral tegmental area and the nucleus accumbens, those core structures of the dopaminergic reward system whose activation produces the neurochemical signature of anticipated pleasure, the same one characteristic of the expectation of food, of gambling, and, at heightened intensity, of drug use. This is expressly not a literary metaphor but a statement about physical circuitry, for the underlying machinery is the same in all the cases named, and that means, in practical consequence, that the subjective experience of the attraction an older man feels toward a young woman is, at the neural level, about as hard to dissolve by a mere act of will as the craving for food is by the bare information about the nutritional value of a dish. The brain simply does not process desire and the rational counterargument over the same pathways, which leaves every appeal to pure reason structurally at a disadvantage here.

At this point terror management theory, developed by Greenberg, Pyszczynski, and Solomon in the 1980s, contributes a dimension a purely reproductive-biological view would entirely overlook. This theory proposes that human beings, in reaction to the tormenting awareness of their own mortality, form psychological defense mechanisms, and that one of these mechanisms consists in proximity to entities that embody youth, vitality, and a temporal future still wide open. The attraction of an older man to a considerably younger woman can, within this frame of interpretation, carry an additional layer that has nothing whatsoever to do with reproduction, namely the psychological relief that grows out of nearness to a person whose horizon of life lies far more distant than one’s own. This is no conscious calculation a man would perform, but surfaces as a diffuse feeling, and it is sincerely hard to separate that feeling cleanly from other kinds of affection, because it feels exactly like them.

Viewed from the other side of the age gap, the prefrontal cortex complicates this already many-layered picture once more in a way that must not be missing from any honest examination. The prefrontal cortex, that brain region responsible for impulse control, for long-term planning, and for weighing consequences, completes its myelination and functional maturation not at the end of puberty but only around the age of twenty-five, a fact established rigorously, among others, by the work of Casey, Jones, and Hare. A 19-year-old who makes a decision about a relationship with a 45-year-old therefore does so with a brain not yet fully equipped for the assessment of long-term relational consequences under conditions of considerable resource and experience asymmetry, which is neither an excuse nor a determinism but simply a datum that ought to be present in every honest conversation about the capacity to consent in relationships with a large age gap, without being the only relevant quantity there. Reason arrives last in this chain, every time.

Halo effect, confirmation bias, and the quiet work of distortion

Several well-documented cognitive biases combine with this neurobiological picture in a way worth naming precisely, because they explain why the described preferences persist and even intensify in environments where the reproductive logic that once produced them has long since gone entirely absent. The halo effect, which Edward Thorndike first documented as early as 1920 in his studies of the rating of soldiers by their officers, describes the human tendency to transfer a positive assessment resting on a single conspicuous trait, unchecked, onto the whole person. In the context of attraction this effect leads the visually conspicuous markers of youth to trigger a whole cascade of generalized positive judgments about personality, intelligence, and character, for which there is not the slightest factual basis.

The young woman at the next table of the pizzeria, whom the older gentleman registers in passing while a pizza and a glass of water stand before him, is judged by him not on the basis of her personality, which is entirely unknown to him, and not on the basis of her values, which are equally unknown to him, but solely on the basis of physical features that set off in his head a cascade of well-meaning attributions which need have nothing whatsoever to do with the real person at the next table. That is no flaw of character in the gentleman, it is the halo effect working exactly the way it always works, and the mere knowledge of its existence does not bring it to stop its work. The mere-exposure effect, which Robert Zajonc demonstrated in 1968, reinforces this picture further, because repeated confrontation with a given stimulus raises the preference for that stimulus independently of its actual properties. In a media landscape that ceaselessly pairs young women in romantic contexts with older, powerful men, exactly this pairing acquires, through its constant repetition alone, a familiarity the brain files as normal, where normal in this connection means something other than natural in the biologically strict sense.

Confirmation bias, finally, sees to it that a once-established preference immunizes itself even against contradicting evidence, because information that supports the preference is systematically weighted more heavily than information that contradicts it. A man with a strong preference for considerably younger women will therefore tend to discount signs of a lack of common ground, to reinterpret generational differences as charming rather than as problematic, and to read the subordination of the younger partner as proof of a harmonious compatibility of character rather than to recognize it as a possible artifact of an existing power differential, which holds him captive in a self-deception that hardens further with every confirmation. Knowledge alone does not stop this machinery.

Economic equality shifts the conditions

The cross-cultural universality of the direction is real and well documented, yet the concrete size of the age gap is by no means biologically fixed, and the evidence for what drives that size in a particular society is decidedly instructive. The gap comes out smallest where societies are economically most equal, and it grows largest precisely where women hold the least economic independence, which is no statistical nuisance to be controlled away but a signal to be taken seriously. In the northern European countries, where female labor participation, educational attainment, and income have reached near parity with men, the average age gap between spouses lies under two years, while in certain regions south of the Sahara, where a heavy economic dependence of women meets a high reproductive pressure, it clearly exceeds the mark of ten years. The analysis of the data from 130 countries found that religiously unaffiliated couples, with an average gap of 2.3 years, stood at the lower end of the scale, while predominantly Muslim communities, with 6.6 years, showed the largest gap, a pattern that correlates closely with the indicators of female educational and economic participation and therefore says far more about social structures than about biology.

This leads us to the insight that evolutionary biology, whatever role it may play in the particular, most certainly does not operate in a vacuum but is either amplified or dampened by cultural structures. Cultural arrangements that curtail the economic options of women raise the tangible advantage a bond with a wealthier older man offers, and they lower at the same time women’s ability to exercise their preferences independently of these material constraints. Precisely this is the part of the story that evolutionary psychology, with its focus on universal mechanisms, tends to underrate, and that conversely sociology and feminist theory, with their focus on structural inequalities, tend to overrate, by treating the whole phenomenon as though it could be reduced entirely to patriarchal control. Both camps are partly right in their respective observations, and both are insufficiently complete in their explanations, which should hardly surprise anyone for a phenomenon this many-layered.

The concept of hypergamy, that is, the statistical tendency of women to pair with men of equal or higher social status, is documented across cultures, even if its interpretation remains contested. The resource-based theory of mate choice holds this preference, quite in parallel to male fertility orientation, to be an evolutionarily shaped strategy, while the social-structural theory sees in it the rational response of women with limited economic options to a market on which male resources promise security. The honest answer is in all likelihood that both processes operate at once, that they are empirically hard to separate from one another, and that the relative contribution of the one and the other shifts noticeably as economic equality grows.

The hamster wheel and the tired truth about desire

At this point I must weave in an observation that stands in none of the cited studies, because it comes from a different source, namely from the sober look at the actual life of adult men in the twenty-first century. The male Homo sapiens today lives in a hamster wheel of professional obligations, financial constraints, and permanent exhaustion that drains him of so much energy that the theoretically present inclination toward the younger partner in practice often never even comes into play, because the strength for it is simply lacking. The small boy inside him, grown mature, knows from experience what many younger men still have to learn, namely that a brief episode of pleasure is as a rule followed by a far longer phase of complications, and that reckoning comes out, with advancing age, ever more clearly against the adventure.

The small boy inside the man has thus not vanished, but he has grown mature, he has grown tired, and he knows by now considerably more about the world and about himself than he did at twenty. A twenty-year-old woman, by contrast, still knows almost nothing about life, which is no disparagement but a plain function of the few years she has so far spent in the world, even if she may well carry within her the biological disposition to sexual attraction toward an older individual. Into this attraction there not seldom mix material considerations as well, because the security an established older man can offer represents a real value for a young woman with limited means of her own, one it would be dishonest to deny. There are certainly young women who feel sincerely and without any calculation drawn to mature, experienced men, and there are just as certainly young women who feel a nearly instinctive aversion to such arrangements and ask themselves how the others can feel the way they feel. This range of female feeling too is a legitimate object of research, and the available findings suggest that the preferences of women are as real and as variable as those of men, only with a different statistical distribution.

I will thus often be asked, and I have in fact been asked often, whether that is even normal, this age gap of thirty years, when one reads of an 80-year-old Hollywood actor whose wife is a mere thirty-six. My answer to that question comes out as uncomfortable as it is clear, for yes, that is still normal, provided the old man with the small boy inside him still has the nerves required for the daily friction that inevitably grows out of so large an age gap when two people from wholly different phases of life want to share the everyday.

I will not pretend at this point that I regard all this from a safe distance, as though the phenomenon did not concern me, for the woman at my side is roughly 10 years younger than I am, and I regard that circumstance with a certain cheerful gratitude, because the arithmetic, macabre as it sounds on first hearing, works out in my case quite pleasantly, since when I am one day 90 she will be only 80 and can, at a pinch, still handle the shopping. Yet even at these modest 10 years, which in not a single statistic of this piece would produce even a measurable blip, a friction arises that I do not want to keep quiet about, and this friction has nothing whatsoever to do with the age of the skin but with the distance between knowledge and experience, and, to be honest, the more exhausting part of that equation lies with me and not with her. I am a person who spends 8 hours a day continuing to educate himself, who soaks up knowledge the way parched ground takes in the first water after the drought, and for whom logical thinking belongs to the day as indispensably as the first coffee in the morning, and precisely this quality, which I will sell to no one as a virtue because in living together it is just as often an imposition, produces a constant friction with a person who comes from a slightly different time and views the world through a slightly different window. Now picture that friction with a 20-year-old, between whom and me, at 56, there would lie not 10 but 36 years and at least two complete educational biographies, and one grasps at once that the real problem of such an arrangement would never be the youth of the woman but the chasm between two worlds of experience, one that no amount of sincere goodwill could bridge, which is why the daily friction I just spoke of is no abstract concept but a very real demand on the nervous strength of both parties.

The forensic finding that no biology excuses

I have laid out the evolutionary-biological, the neuroscientific, and the cross-cultural findings this fully up to here because one must know them in order to understand the decisive point, and that point is that all these findings speak, without exception, of tendencies, of distributions, and of averages in large populations. They say nothing whatsoever about whether a particular single relationship is consensual, just, or legal, and precisely at this transition from population-wide statistics to a statement about the individual case the arguments run astray in both directions, in my long forensic experience, with regularity. In my work with digital evidence I have more than once come upon a certain species of defense brief that wanted to draw from a carefully assembled stack of evolutionary-psychological literature the conclusion that the defendant’s attraction to considerably younger persons was no pathology but a trait of the male brain shaped over millions of years, so that there could be no talk of criminal intent in the proper sense, since biology itself was the architect of this inclination.

This argument fails for a reason that would become obvious at once if one applied the same logic to any other field. Aggression is likewise an evolutionarily shaped trait with extensive cross-cultural documentation, and so too is the tendency to favor members of one’s own group over strangers in the distribution of resources, yet no one would hit on the idea of invoking the documented universality of these inclinations as a defense for having given in to them in a context where doing so was harmful, non-consensual, or simply illegal. Evolution produces the appetite, but law and ethics govern what a person actually does with that appetite, and that governance is no arbitrary paternalism but the foundation of every civilized coexistence. The cases that have passed through my forensic examination in connection with the exploitation of age gaps, and there were not a few, share structural features that have nothing whatsoever to do with evolutionary biology and everything to do with the systematic exploitation of an asymmetric power.

A wealth differential, a status differential, an emotional dependence carefully cultivated over time, the controlled steering of a younger person’s information and social contacts, and the targeted deployment of material means to create conditions under which an exit from the relationship becomes practically impossible are the actual mechanisms of exploitation, and these mechanisms are not natural but thoroughly deliberate. I recall a case from my practice, whose particulars I do not describe for obvious reasons, in which in the end a single physical finding sufficed to prove a deed that had previously been denied with all the eloquence of minimization, and the confession followed almost the moment the finding lay on the table. I have learned in such moments that the language of perpetrators is supple and the language of traces is not, and that precisely in this difference forensic work finds its meaning. These mechanisms often operate, what is more, within relationships that are, in the technical sense, entirely legal, and precisely for that reason the legal question and the ethical question must be carefully kept apart, because the one neither replaces nor cancels the other. The data on the prefrontal cortex are relevant here in a specific way, for an eighteen-year-old is in most legal orders an adult and may decide about her own life, yet that same eighteen-year-old makes her decisions about a relationship with a fifty-five-year-old with a neural apparatus whose maturation will not be complete for another seven years. That does not make such a relationship illegal, but it means that the frame of informed consent, which is perfectly appropriate for two adults of the same age, does not transfer seamlessly to relationships in which the developmental and the experiential asymmetry runs this large.

The feminist critique, its strong and its weak parts

The feminist critique of relationships with a large age gap is no uniform edifice, and it is worth separating its empirically well-founded parts from those that do not hold up under sober examination. Among the well-founded parts belongs the observation that the systematic devaluation of aging women as partners, alongside the simultaneous elevation of aging men into distinguished personalities, is a purely cultural artifact without any biological necessity, one attended by considerable and well-documented harm. The fact that an older woman who desires a younger man is socially coded as pitiable or even predatory, while an older man who desires a younger woman is socially coded as successful and enviable, is no product of evolutionary biology but the product of a cultural coding that measures with two standards. The economic structures too, which historically and in many world regions to this day make older, wealthier men attractive partners for women who lack independent economic options, are real structural constraints and by no means the pure expression of a freely chosen preference.

Among the empirically considerably weaker parts of the critique belongs, by contrast, the claim that any notable age gap necessarily means a power differential and is thereby inevitably ethically reprehensible, along with the related claim that women who enter into a relationship with a large age gap by definition exercise no real agency. The empirical record includes, after all, relationships with a large age gap that are by every reasonable standard functional, mutual, and just, and it includes at the same time relationships with a minimal age gap shaped by coercion and harm, from which it follows that the age gap is a correlate of certain risk factors and never a determinant of relationship quality. The available studies of divorce risk do point in the direction that larger age gaps go together with a higher probability of failure, yet these are statistical headwinds and not inescapable fates, and the exact percentage figures that circulate in popular accounts I hold to be less reliable than they appear there, which is why I deliberately do not cite them here as hard numbers.

Whoever wholesale discards all relationships with a large age gap as inherently exploitative does in the end exactly the same thing as that defender who abuses the evolutionary evidence as a blank check, only in the opposite direction, because both treat a population-wide statistical tendency as though it were a reliable statement about every single concrete case. The ethics of a particular relationship depend, however, on the concrete conditions of exactly that relationship, that is, on the degree of genuine reciprocity, on the real freedom to leave the relationship again, on the presence or absence of economic coercion, and on the psychological dynamics between the persons involved, and no statistic, however impressive, can ever replace this examination of the individual case.

A note to the reader for whom this subject is uncomfortable

I want to remark openly at this point that this subject produces a deep unease at both ends of the ideological spectrum, and that this unease is under no circumstances a permissible reason to distort the evidence at hand in the one direction or the other. The reader convinced that evolutionary psychology is nothing more than an elaborate rationalization of male misconduct will find the cross-cultural data on fertility preference uncomfortable and will look for reasons to push them aside. The reader convinced, by contrast, that evolutionary arguments already settle the ethical question will find the discussion of structural coercion and the entire forensic finding uncomfortable and would most like to skip over those parts. Both are sitting, figuratively speaking, in the same pizzeria right now, looking over at the next table where a visible age gap has taken a seat, and drawing from it conclusions that the data, correctly understood, do not fully support in either direction.

The algorithm is real, and the algorithm does not justify its own outputs in every arbitrary context, and these two statements are true at the same time, and to bear both at once, without prematurely pressing them into a single simplified verdict, is exactly the analytical demand this subject places on every honest observer. Whoever cannot bear this tension but dissolves it by collapsing onto one of the two comfortable sides has not understood the subject but merely confirmed his own prejudice.

Where the line runs, and why it is immovable

Now I come to that part for whose sake I drew the sharp distinction so carefully from the very beginning, because here runs a line that no evolutionary explanation, however deep, may ever soften. Everything I have described up to here refers to the attraction between adult human beings, and the entire biological mechanism is oriented toward the markers of reproductive maturity, that is, toward the signals an already sexually mature adult body sends out. Precisely for that reason sexual interest in prepubescent children is no extreme special case of the same mechanism but something categorically different, because the child’s body lacks exactly those markers to which the described algorithm responds at all, which is why pedophilia counts in clinical science not as an intensification of a normal preference but as a qualitatively deviant, pathological orientation, classified in the DSM-5 and in the ICD-11 as a disorder in its own right. Neuropsychiatric research, in particular the extensive work of James Cantor and his group, has documented measurable neurobiological anomalies in pedophilic men, among them a significantly reduced white matter in the brain, on statistical average lower intelligence scores, and an elevated rate of non-right-handedness, which points to a disturbance of brain development with a prenatal or perinatal origin.

These findings explain why some people cross a line that for the overwhelming majority is non-negotiable, and why some of these people are prepared to take an extreme risk that extends to regular travel to distant countries, because they imagine themselves in false safety there and believe the reach of the law ends at the border of their home country. Let it be said to these persons with the full authority of a decades-long forensic career that they are thoroughly mistaken, and I will also explain to them why, because the technical reality today is a different one from the years in which I still had to sift seized hard drives image by image by hand. Known abuse material is by now recognized through perceptual hashing methods, the best known of which, PhotoDNA, was developed in 2009 by Microsoft Research together with the image forensics expert Hany Farid, and which generates from each image a robust digital fingerprint that still triggers even when the file has been resized, cropped, or recolored, and that is matched against the millions of multiply verified signatures held in the databases of the reporting centers. What hash matching cannot in principle accomplish, namely recognizing new material never seen before, is by now handled by machine classifiers trained on enormous quantities of data, which flag even previously unknown recordings as suspicious with a high hit rate, whereupon a human confirms them. With these tools, and with the international networking of the investigative authorities that builds on the same databases, we will find you, no matter in which country you have tried to bring yourself to safety, and the probability of remaining undiscovered sinks with every year in which these systems grow better. German criminal law prosecutes such acts under the principle of universal jurisdiction even when they were committed abroad and the perpetrator is German, entirely without the otherwise usual requirement of double criminality, and American law provides for travel to such ends and for the act itself prison terms of up to thirty years, regardless of whether the act would have been legal in the country of travel. The scale of this crime is shattering, for the American reporting center NCMEC alone registered in 2023 more than 36 million reports of the sexual exploitation of children with over 100 million individual files, with more than 90 percent of the uploaded content originating outside the United States. A joint study by INTERPOL and ECPAT International from 2018 evaluated, for exactly this purpose, the metadata of more than one million such media files and analyzed 800 series of them visually, with a finding that translates the cold statistic back into human cruelty, for 84 percent of these 800 series contained severe sexual abuse, and more than 60 percent of the unidentified victims were prepubescent, infants and toddlers expressly included.

I broach at this point something I neither want to nor can lay out within this frame, because it demands an examination of its own and a far harder one. In the cases that passed across my desk the perpetrators were almost without exception men, and they matched, contrary to what the cliche of the lonely stranger suggests, mostly the image of the acquaintance from the child’s immediate surroundings, often married, because the bourgeois facade of marriage and profession is part of the camouflage and not its contradiction. The material at issue, that is, the data forming the object of the criminal charge, which I had to sift and categorize, showed in my case files predominantly small boys and not, as many people reflexively assume, small girls, which I expressly mark as my personal case reality and not as an overall statistic, because that statistic shows, across all recorded cases, girls rather than boys as victims, while the most violent material disproportionately concerns boys, and that exclusively child-fixated type of perpetrator, who weighs heaviest of all, targets the unrelated boys in particular. Why exactly these men feel drawn to boys, why among the perpetrators there are virtually no women, and why so many boys become victims, are questions I only want to raise here and deliberately not answer, because every serious answer needs more room and more severity than this text can carry. What further struck me in practice was a pattern that could be no coincidence, for conspicuously often they were teachers, clergymen, youth workers, and coaches, that is, people who had sought out a profession in the immediate vicinity of children, and it takes no forensic training to recognize that here it was not the profession that formed the person into a perpetrator but the perpetrator who chose the profession according to access to the victim. To be distinguished, finally, are those who confine themselves to mere viewing, those who commit the deed with their own hands, and those who make money from this depravity by turning the documented suffering of a child into a tradable commodity, and these categories weigh differently, in law as in morality, without any one of them ever weighing light.

The algorithm is older than Homo sapiens, the conscience is younger

There are a few things the science of age-gap attraction tells us with reasonable certainty, and I want to name them once more at the close so clearly that no room remains for the comfortable misunderstanding that accompanies this subject so reliably. The preference of older men for younger women is documented across cultures, it is neurobiologically anchored, and it cannot be reduced to mere social conditioning, because it appears in cultures that have scarcely anything in common with one another. The concrete size of this preference in a given society is at the same time determined considerably by how much economic independence the women of that society possess, from which it follows that the evolutionary tendency is real while its expression is by no means biologically fixed but shifts with social conditions. The biological explanation of a preference is never a legal or moral defense for giving in to that preference in a way that does harm or involves coercion, and this sentence is no complicated philosophical trick but a plain matter of course one must state only because it is so often deliberately passed over.

Early Homo sapiens, in his small human group, so runs my personal conjecture, expressly marked as pure speculation, which I can prove by no source and do not want to prove, may have applied other standards to the age of a reproductively capable individual than the ones we know today, and this conjecture changes nothing whatsoever about the assessment of the present but merely describes how long the road was that our civilization has traveled. For even if such behavior existed in the gray prehistory without the concept of wrong, it is precisely the invention of that concept, the erection of social and legal boundaries around the protection of the child, that is the real achievement of civilization, one behind which no one is permitted to fall back who appeals to nature. Precisely for that reason it is a blessing and not a matter of course that we today have social and legal rules that set a boundary to the raw drive, and precisely at this boundary explaining parts ways from excusing with a finality that permits no compromise. For whoever sexually abuses a child rapes a child, and this act is, independent of any legal situation in any country on earth, a crime against a defenseless human being that not only crosses a legal boundary but inflicts on the child a wound it will carry with it its whole life long, in exactly that corner of the mind which, as I know only too well from my own professional experience, never fully closes again. About this crime, which in many countries additionally constitutes a punishable act and which, owing to various social circumstances, unfortunately occurs ever more frequently in Europe too, I will write in a piece of its own, one that will turn out so honest and so detailed that reading it will be hard to bear, because this subject deserves the separate and unvarnished examination it cannot receive within this frame.

The evolutionary algorithm that directs male attention toward youth is older than Homo sapiens itself, and it will most certainly not be revised by this piece, because it eludes revision by argument entirely. What can very well be revised, by contrast, is the quality of the conversation we hold about it, and that quality hangs solely on the willingness to insist that explaining a tendency and excusing its abuse are two wholly different intellectual operations, whose confusion serves neither the truth nor those people who, through exactly this confusion, are most likely to come to harm.

The announced follow-up will be the hardest I have ever written, so honest and so detailed that reading it will be an imposition, and it will appear only after my book titled “Das Hamsterrad.” Anyone who researches and writes independently knows the plain truth behind this, for serious work on such a subject needs a foundation that does not finance itself, and this book is the way to build that foundation.

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