Modern Wisdom

Podbit · Modern Wisdom

The Uncomfortable Science Of Sex Differences - Steve Stewart-Williams - #1120

Explore episode Jul 6, 2026

Where this was said

What Is the Biggest Sex Difference?

At 35:00 · chapter starts 29:02

Rather than dismissing sociocultural explanations, Stewart-Williams stress-tests them. Research in Western societies actually shows parents treat sons and daughters fairly similarly in key domains — equally encouraging independence and success. Behavioural genetics' second law (identical twins reared apart are often no more different as adults than those reared together) pulls the rug from claims about large parental effects. Then comes the centrepiece: the gender equality paradox. Both social role theory and patriarchy theory predict that stricter gender norms and more patriarchal societies should amplify sex differences. The data consistently show the opposite — in more egalitarian, less patriarchal societies, differences in personality, career interests, and even physical traits like height actually tend to be larger. Stewart-Williams admits this surprised even him: he had expected patriarchy to push the sexes further apart. The sociocultural rebuttal — that sex-segregated societies skew self-report comparisons — is acknowledged but countered: the paradox also appears in objective cognitive and physical measures, not just personality surveys.

Science
Reproductive Variance: The Root of All Sex Differences

The Uncomfortable Science Of Sex Differences - Steve Stewar… · Jul 6, 2026 Science

The deeper you go into sex differences, the more everything traces back to one thing: variance in offspring number is greater in males. When some males can have many offspring and others have none, selection becomes intense — for aggression, status-seeking, risk-taking, and interest in multiple partners. Females, with a lower ceiling, evolve to be choosier.

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