Williams20 May 2024

Why Are Differences Between Men & Women Being Denied? - Steve Stewart-Williams - #786

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19Insights

Insights & moments

The myth-busts, hot takes, explainers, and tools worth keeping.

Myth Buster· 2

Myth Buster13:30

The Biggest Psychological Sex Difference Is Obvious—But Ignored

The guest argues that the most significant psychological sex difference is sexual orientation: most men are attracted to women, and most women to men. Despite its magnitude, it's often overlooked in discussions of sex differences because it’s taken for granted.

This is the largest psychological sex difference.
It’s rarely mentioned because it’s considered obvious.
It shows that natural selection can produce major sex differences.
Other differences, like aggression or toy preference, are smaller in comparison.

“The vast majority of men are primarily interested in women and the vast majority of women in men. That’s a massive difference.”
guest · 14:00

#sex-differences#sexual-orientation#evolution#psychology

Myth Buster23:30

Anorexia Isn’t an Ancient Birth Control Strategy

The guest rejects the idea that anorexia is an evolved adaptation for birth control, arguing instead that it’s a modern cultural byproduct of status competition and mate-seeking behaviors in wealthy societies.

Anorexia is rare in non-industrial cultures.
It’s more common in societies with extreme thinness ideals.
It’s likely a maladaptive extension of intersexual competition.
Not an evolved trait, but a cultural distortion of natural impulses.

#anorexia#evolutionary-psychology#cultural-byproduct#mental-health

Hot Take· 2

Hot Take09:30

We Prefer People Who Look Like Us—And That’s Not Always Good

The guest acknowledges that humans have an innate affinity for those who resemble them, which can foster bonding but also enable racism. However, this bias can be overridden by shared culture or language, such as accents, which serve as stronger in-group signals.

Visual similarity triggers subconscious affinity.
This can lead to tribalism and racial bias.
Accents and shared language often override physical differences.
We’re not stuck with these biases—they can be socially reshaped.

“There's a dark side to that... it makes racist memes easier to accept.”
guest · 09:30

#tribalism#racism#in-group#accents

Hot Take41:30

The Soft Bigotry of Male Expectations

The guest coins the term 'soft bigotry of male expectations' to describe how society assumes male-typical behaviors (like hunting) are superior, while questioning why women don’t do them—while rarely asking why men don’t do female-typical tasks like gathering.

Society questions why women don’t hunt, but not why men don’t gather.
This implies male roles are more valuable.
It subtly devalues women’s traditional contributions.
Even 'pro-feminist' narratives can carry this bias.

“No one was asking why aren’t men doing more berry collection.”
guest · 41:30

#gender-bias#feminism#cultural-norms#sex-roles

Explainer· 7

Explainer00:00

How an Alien Scientist Would See Humans

The guest uses the thought experiment of an alien scientist encountering humans to highlight how strange human behaviors—like sex differences, jealousy, music, and art—would appear from an outside perspective. These traits, while familiar to us, are deeply puzzling when viewed objectively.

Humans are divided into two sexes with distinct differences in behavior and attraction.
We form pair bonds, experience jealousy, and favor family—behaviors not obvious for survival.
We invest heavily in non-survival pursuits like music and art.
An alien without such traits would find human culture bewildering.

“How would an alien scientist view our species? It would be mystified by us.”
guest · 00:00

#evolutionary-psychology#human-behavior#culture#sex-differences

Explainer01:30

Why Culture Makes Humans Unique

The guest argues that while many human traits have parallels in the animal kingdom, culture is what truly sets us apart. Our capacity for cumulative cultural evolution allows ideas to evolve independently of genes, creating a system that can diverge from biological imperatives.

Culture is the most distinctive human trait from an evolutionary standpoint.
Humans evolved the ability to learn and transmit knowledge across generations.
Cultural evolution operates independently of genetic evolution, sometimes in opposition.
Ideas (memes) replicate based on their own fitness, not just biological benefit.

“What really makes us unique is culture. That would be the thing that particularly mystifies the alien.”
guest · 01:30

#cultural-evolution#memes#human-uniqueness#evolution

Explainer02:30

How Selection Works in Genes and Culture

The guest explains that selection acts on any replicator—biological or cultural. Genes are selected based on reproductive success, while cultural elements (memes) spread based on their ability to be remembered, shared, and adopted, even if they don't benefit survival.

Selection favors replicators that are good at copying themselves.
In biology, this means genes that boost survival and reproduction.
In culture, it means ideas that are catchy, emotionally resonant, or socially useful.
Memes can spread even if they harm the individual, unlike genes.

“You get selection for the variants that are best able to replicate themselves.”
guest · 03:30

#natural-selection#cultural-evolution#memes#replicators

Explainer15:30

Why Men and Women Experience Jealousy Differently

The guest explains that men are more distressed by sexual infidelity, while women are more upset by emotional infidelity. This stems from evolutionary pressures: paternity uncertainty for men, and risk of losing investment for women.

Men are more threatened by sexual infidelity due to paternity uncertainty.
Women are more threatened by emotional infidelity due to risk of losing partner investment.
Both forms of jealousy protect pair bonds, which were crucial for raising offspring.
These differences persist across cultures and time.

#jealousy#sex-differences#pair-bonding#evolutionary-psychology

Explainer26:30

Six Lines of Evidence for Innate Sex Differences

The guest outlines six key arguments for why sex differences aren’t just socialized: their stability over time, early emergence in childhood, persistence despite cultural opposition, hormonal influences, cross-cultural universality, and parallels in other species.

Sex differences persist across cultural shifts like feminism.
They appear before socialization can fully act.
They resist social discouragement (e.g., aggression in boys).
Prenatal hormones influence later behavior.
They’re consistent across cultures.
Similar patterns appear in other species under similar selection pressures.

#sex-differences#evolution#biology#socialization

Explainer43:00

Why Sex Differences Grow in Equal Societies

The guest explains the gender equality paradox: as societies become more equal, sex differences in interests and careers often increase, not decrease. This may be because people in freer societies can better express innate preferences.

More gender-equal nations show larger sex differences in some traits.
This contradicts social role theory predictions.
Greater freedom allows people to follow innate interests.
Individuality and wealth correlate with larger average sex differences.

#gender-equality#sex-differences#paradox#societal-development

Explainer63:30

Why Humans Practice Mutual Mate Choice

The guest describes the mutual mate choice model: both sexes compete for mates and both are choosy. This differs from the traditional 'males compete, females choose' model and better fits human behavior, especially in long-term relationships.

Both men and women compete for desirable partners.
Both sexes are selective, though women are choosier on average.
Driven by high parental investment from both sexes.
Made possible by large brains and cultural complexity.

#mate-choice#sexual-selection#human-mating#evolution

Story· 2

Story07:30

Why Identical Twins Grieve More

The guest discusses research showing that people grieve more for identical twins than fraternal twins, suggesting that genetic similarity influences emotional bonds. This supports the idea that we are biologically attuned to genetic relatedness.

Identical twins share 100% of their genes, fraternal twins about 50%.
Grief intensity correlates with genetic closeness.
This implies an evolved sensitivity to kinship at a genetic level.
Even without shared upbringing, identical twins feel stronger affinity.

“People grieve more if they lose an identical twin than if they lose a fraternal twin.”
guest · 08:00

#genetics#grief#kinship#twins

Story38:30

The Flawed Attempt to Debunk 'Man the Hunter'

The guest critiques a recent study that claimed hunting was gender-equal among hunter-gatherers, pointing out coding errors and selective data use. He argues the traditional view—that men hunted and women gathered—still holds.

A 2023 study claimed women hunted as much as men.
It included societies without female hunting due to coding errors.
It ignored frequency, counting rare events as common.
More comprehensive data supports the traditional division of labor.

#hunter-gatherers#sex-roles#anthropology#debunking

Q&A· 2

Q&A20:00

Why Do Women Have Concealed Ovulation?

The guest discusses several theories for why human females don’t display obvious signs of fertility. He finds two most plausible: that there was no evolutionary pressure to advertise ovulation, or that concealed ovulation promotes pair bonding by encouraging continuous sexual contact.

Unlike baboons or chimps, humans lack visible fertility signals.
One theory: no selection pressure to advertise ovulation.
Another: concealed ovulation strengthens pair bonds by increasing mating frequency.
This may have helped ensure male investment in long-dependent offspring.

#ovulation#human-mating#pair-bonding#evolution

Q&A45:30

Why Are There Fewer Women in Physics and Engineering?

The guest argues that while discrimination plays a role, innate differences in interest—men more in objects, women more in people—also shape career choices. These preferences appear early and globally, suggesting a biological component.

Interest in people vs. things is one of the largest sex differences.
It appears across 80 nations in half a million people.
It predicts occupational choices better than discrimination alone.
Ignoring it leads to incomplete explanations for STEM gaps.

#stem#occupational-choice#sex-differences#interests

Tool· 2

Tool34:30

Toy Preferences Reveal Deep-Rooted Sex Differences

Studies show that male and female children, as well as young monkeys, show sex-typical toy preferences—boys favor vehicles, girls favor dolls—even when raised without gendered socialization, suggesting an innate basis.

Boys prefer toys with motion (trucks), girls prefer nurturing toys (dolls).
This appears in children regardless of gender-conforming upbringing.
Similar patterns seen in macaques and vervet monkeys.
Suggests evolutionary roots in spatial vs. caregiving skills.

“You find that in vervet monkeys and macaques... the boys will pick that.”
guest · 35:00

#toy-preferences#sex-differences#evolution#primates

Tool59:30

What Human Testicle Size Reveals About Mating

The guest explains that relative testicle size indicates mating systems: chimps (large testes) are promiscuous, gorillas (small) are harem-based, and humans are in between—suggesting some sperm competition, but primarily pair bonding.

Larger testes correlate with promiscuous mating systems.
Human testes are closer in size to pair-bonding gibbons than to chimps.
Suggests moderate sperm competition in human evolution.
Supports pair bonding as the primary mating strategy.

#mating-systems#sperm-competition#human-evolution#testicle-size

Takeaway· 2

Takeaway05:00

Why Humans Are 'Modified Grandchildren Maximizing Machines'

The guest explains that humans evolved not just to survive or reproduce, but to ensure the survival of descendants across generations. This includes helping relatives raise their offspring, a concept known as inclusive fitness.

Survival alone doesn't pass on genes—reproduction is key.
Having offspring isn't enough if they don't survive to reproduce.
Helping relatives raise children also spreads shared genes.
Thus, we're optimized for long-term genetic legacy, not just personal reproduction.

#inclusive-fitness#evolutionary-psychology#reproduction#kin-altruism

Takeaway72:00

How to Live Well Knowing We’re Shaped by Evolution

The guest argues that understanding evolutionary psychology isn’t disempowering—it allows us to step back from automatic impulses, choose our values, and live more intentionally, rather than being blindly driven by ancestral programming.

Knowing the origins of desires helps us question them.
We can choose values beyond gene propagation.
It’s possible to 'hack' evolved emotions like jealousy.
Freedom comes from awareness, not ignorance.

“We can choose our own meanings in life rather than having a meaning imposed on us from outside.”
guest · 80:00

#meaning-of-life#agency#evolutionary-psychology#self-awareness