Episode Summary
Executive Summary: Michael Shermer interviews David Buss about his book on the evolutionary roots of men’s bad sexual behavior. Buss argues that sexual violence, harassment, jealousy, deception, and infidelity are best understood through proximate and ultimate causes, with sex differences, mate value, status, entitlement, and the dark triad shaping conduct. The discussion emphasizes scientific explanations, legal/social reforms, and female autonomy as key to reducing harm.
Main Topics: Evolutionary psychology of mating and sex differences: Buss explains how reproductive biology produced enduring sex differences in mating psychology, preferences, jealousy, and sexual strategy, especially because women bear higher minimum reproductive costs than men. Why men behave badly: sexual coercion, harassment, and assault: The conversation centers on male behaviors that undermine female choice, including coercion, harassment, stalking, abuse, and assault, and why these patterns recur across cultures. Dark triad, entitlement, and individual differences: Buss argues that not all men are equally likely to offend; narcissism, psychopathy, and Machiavellianism interact with short-term mating orientation and status to predict coercive behavior. Mate value, jealousy, breakup violence, and mate guarding: He describes how mate-value discrepancies and sexual proprietariness can drive abuse, isolation, and post-breakup violence, especially when men fear losing a partner to a higher-value rival. Science, law, and policy responses: The discussion covers consent standards, harassment policy, legal definitions, reporting requirements, and why social institutions should reflect actual sexual psychology rather than ideology. Cultural change, patriarchy, and moral progress: Buss and Shermer discuss how patriarchal norms emerged from evolved psychology, how laws have changed over time, and how expanding women’s sexual autonomy represents moral progress. Cross-cultural evidence and replication: They stress that many sex-difference findings replicate across cultures, including non-Western and more gender-equal societies, strengthening the evolutionary case.
Key Arguments: Evolutionary theory provides a non-arbitrary framework for explaining human mating psychology, unlike older personality theories that lacked falsifiable foundations. Sexual conflict is ancient and universal; understanding its causes is necessary for effective prevention and policy, not an excuse for abuse. Male sexual jealousy, mate guarding, and sexual proprietariness can motivate intimidation, verbal abuse, physical abuse, and isolation of women. Women’s victimization is often tied to male efforts to control female choice, especially during breakups or when a man’s mate value is lower than his partner’s. The dark triad predicts sexually coercive behavior more strongly than simplistic notions that only socially unsuccessful men commit such acts. Power can amplify sexual entitlement and lower empathy, but rape and harassment are still driven by intertwined motives of sex, power, and violence. Women’s sexual psychology is more selective in short-term contexts; men are more prone to overperceive sexual interest and send unwanted signals based on their own preferences. Social norms and legal rules matter, but they work best when informed by accurate science about sex differences and typical patterns of behavior. No single intervention will eliminate sexual conflict; reducing harm requires multiple levels of response: law, norms, education, and understanding of male/female psychology. Female choice over when, where, and with whom to have sex is presented as a fundamental human right that men have historically tried to undermine.
Data Points: Breakup danger window: first 3–6 months - Buss says women are at greatest risk of physical/sexual violence and murder after a breakup during this period. Adult female homicide perpetrator relationship: 50–70% - If an adult woman is killed, the killer is often a boyfriend, husband, ex-boyfriend, or ex-husband. Adult male homicide perpetrator relationship: 3% - Romantic partners or ex-partners are far less often the killers of adult men. Pandemic intimate partner violence spike: about 20% - Buss cites estimates that IPV increased during the pandemic due to lockdowns and economic strain. Women’s preferred sex partners over 30 years (Norway): 5 - Average number preferred by women in a cited study of future sexual partners. Men’s preferred sex partners over 30 years (Norway): 25 - Average number preferred by men in the same study, illustrating desire for sexual variety. Men willing to have sex without kissing: 53% - Cited sex difference showing men are more willing than women to forgo kissing before intercourse. Women willing to have sex without kissing: 14.6% - Cited comparison to men’s responses in the same survey. Women rating men as below average: 80% - In online dating studies, women on average rate most men as below average in attractiveness. Men saying they would be flattered by coworker’s sexual proposition: 67% - Used to illustrate gender differences in perception of unwanted sexual advances. Men saying they would be insulted by coworker’s sexual proposition: 15% - Contrast with women’s reactions to the same hypothetical proposition. Women saying they would be insulted by coworker’s sexual proposition: 63% - Shows women more often perceive such propositions as offensive or harassing. Women saying they would be flattered by coworker’s sexual proposition: 17% - Contrast with men’s reactions to the same hypothetical proposition. Genetic cuckoldry/non-paternity: 1–3% - Buss says meta-analyses suggest lower rates than older estimates of 10–30%. Older estimates of non-paternity: 10–30% - Mentioned as prior, likely inflated figures before newer meta-analyses. Female responses in anonymous sex-request study: 0% initially; a few percent when safety and familiarity were increased - Illustrates strong female selectivity in short-term mating scenarios. Men’s and women’s sample in prison target study: 53 inmates - Prison inmates showed consensus on who they would victimize based on gait cues.
Pivotal Quotes: "to understand all is to forgive all ... it is only a temporary suspense of ethical judgment made because to condemn much is to understand little." — Michael Shermer (quoting Lewis Fry Richardson): Used to argue that understanding the causes of violence does not excuse it. "women themselves, not boyfriends, husbands, or fathers, should have sole autonomy over their own bodies." — David Buss: From the closing argument of the book, framing female autonomy as the central moral principle. "the first law [of mating] ... female choice about who, when, where, and under which circumstances the woman is going to engage in sex." — David Buss: Buss describes female choice as the core principle shaped by sexual selection and violated by coercion.
Implications: Listeners are urged to replace moral panic and ideology with evidence-based prevention: clearer consent norms, better education, smarter policy, and attention to the male traits and situations that elevate risk. Understanding sexual conflict, rather than denying it, is presented as the path to safer institutions and greater autonomy for women.