✶Explainer01:30
Why women may have fewer, deeper friends: the allo-parenting hypothesis
Krems is candid that the field doesn't fully know why women evolved fewer, deeper friendships. Leading explanations: non-human primate evidence that a few close female friends boost a female's and her offspring's longevity, and the allo-parenting idea that the high cost of entrusting your child to the wrong person raises women's threshold for calling someone a good friend.
- Honest uncertainty: the field doesn't have a settled answer
- Primate data: close female friends boost female and offspring longevity
- Allo-parenting raises the cost of choosing a bad friend
- Patrilocality may design women to form kin-like bonds with non-kin
“having just a few close female friends can increase the female's own longevity and the Health and Longevity of her Offspring”
“if you're going to put your child into the hands of somebody else that to me would suggest okay well I need to make sure…”
#alloparenting#friendship#fitness
✶Explainer13:30
Why reputational attacks on women are harder to refute
Krems argues the traits women are reputationally valued for, like chastity, loyalty and trustworthiness, are hidden and hard to prove, so a false accusation is nearly impossible to disprove. Men's reputational vulnerabilities, like being poor or weak, are on display and can be refuted with visible evidence such as a Rolex or a sports car.
- Chastity and fidelity are hidden traits that can't be demonstrated
- You can't prove how little sex you're having
- Men can refute 'you're a bum' by showing money or status
- Loyalty and trustworthiness are hard to assess for everyone
“if a woman gains a reputation as being unfaithful or sexually promiscuous that's a really hard reputation to do away with right you can't show…”
#reputation#intrasexual-competition#sex-differences
✶Explainer18:00
Attractive women attract more aggression, and more friends
Krems explains a bind: more attractive women evoke more aggression from other women because they're stronger mating competitors, yet they're also formidable allies who accumulate goodies, friends and higher salaries. That makes them simultaneously dangerous rivals and desirable friends, which complicates the simple 'attractive equals disliked' story.
- Attractive women draw more aggression as mating competitors
- But attractiveness also brings status, friends and resources
- This makes attractive women both powerful allies and dangerous rivals
- A merely promiscuous woman offers no upside, so aggression is easy
“attractive women actually evoke or attract more aggression from other women”
#attractiveness#female-aggression#intrasexual-competition
✶Explainer20:00
Men want higher-status friends; women can't be seen to strive
Men are happy, even eager, to befriend guys who out-compete them, because a stronger ally makes the whole group more formidable. Women face the opposite pressure: openly striving or claiming superiority ('mine's even better') gets you excluded, so women must compete to get what they want while hiding that they're competing.
- Men prefer friends further up the hierarchy than themselves
- A better ally strengthens the coalition, so it isn't threatening
- Girls learn not to stand out or seem superior
- Women face a bind: must compete but can't be seen competing toward friends
“guys love being around other successful guys and they're even actually pretty big fans of being friends with guys that can out-compete them”
“they just don't want their female friends to be competitive toward them”
#status#coalitions#sex-differences
✶Explainer23:00
Friend guarding: the friendship version of mate guarding
Krems introduces friend guarding as a parallel to mate guarding. Just as a partner who feels a mate slipping away may deploy cost-inflicting tactics, people guard valued friendships against poachers. The surprising twist: unlike romantic jealousy, being guarded by a friend isn't automatically hated, and can be read as a welcome cue of how much you're valued.
- Friend guarding mirrors mate guarding, aimed at a friend not a partner
- The traits that make a poacher scary differ between friends and mates
- People are not universally predisposed to hate being guarded
- A friend guarding you can read as a signal that they value you
“friend guarding can look really similar to mate guarding it's just your guarding a friend instead of a mate”
#friend-guarding#mate-guarding#jealousy
✶Explainer31:30
Where fat sits matters more than how much: gut vs hips
Krems describes what she believes is the first empirical study showing fat stigma tracks not just body size but fat location. Two women of identical height, weight and BMI are judged very differently: the one carrying fat in her gut is stigmatized more than the one carrying it in hips and thighs. Waist-to-hip ratio likely signals youth and future reproductive value rather than immediate fertility.
- Fat stigma is sensitive to location, not just amount
- Gut fat is judged more harshly than hip and thigh fat
- Low waist-to-hip ratio likely signals youth and future reproductive value
- Gut fat is the type linked to type 2 diabetes and heart disease
“the woman who carries her fat in her gut is going to be stigmatized much more people have much less favorable views of her”
#body-image#waist-hip-ratio#attraction
✶Explainer42:30
Why women dress modestly when new to a group of women
Krems presents her wardrobe research: women flexibly calibrate how much skin they show based on who they'll be around and their aggression risk. When new to a group of women they've never met, they dress more modestly to avoid being excluded or attacked. She cites Tracy Vaillancourt's study where the same woman, dressed provocatively, drew stares and insults from strangers who didn't know they were being observed.
- Women adjust outfit modesty to context and aggression risk
- New-to-group situations trigger the most modest dressing
- Experiments let women pick an outfit for a women-only night
- Vaillancourt's confederate was insulted when dressed provocatively
“particularly when women are new to a group they're going to meet other women they're more likely to dress modestly so as to not be…”
#wardrobe#female-competition#modesty
✶Explainer58:00
Abortion attitudes as a mating strategy, not just morality
With Martie Haselton, Krems argues opposition to abortion can function as a mating-strategy defense. Committed sexual strategists are threatened by an environment of cheap casual sex, so they benefit by restricting it. A three-bills experiment found that people who call abortion 'murder' back only the bill that punishes women, and actually oppose bills that save the same number of lives via sex ed or newborn care, suggesting the stated motive isn't the real driver.
- Committed strategists are threatened by an atmosphere of casual sex
- Restricting abortion, birth control and drugs reduces casual sex
- Three bills saved equal lives; only the punitive one drew support
- Stated 'saving lives' motive didn't predict supporting life-saving bills
“the more that I think abortion is murder the more that I want to punish women for having abortions um but we actually see slight…”
#abortion#sexual-strategy#morality
✶Explainer85:30
Why women's friendships are dyadic and men's are club-like
Women form intense, personalized one-to-one 'best friend forever' bonds; men's friendships are casual and group-based, easily swapped when a friend moves away. Dunbar links women's dyadic bonds to needing support after moving into a husband's community, and men's interchangeable bonds to warrior-group defense where casualties must be absorbed.
- 85% of women have a BFF, usually another woman; men rarely do
- Social networks stay ~70% same-sex from age 5 to 85
- Women's bonds are personal and dyadic; men's are casual and club-like
- Male bonds are group-based and interchangeable, fitting warrior/defense roles
“for women those friendships are personalized and dyadic and very focused on the individual... men's friendship is kind of more casual... club-like”
#friendship#gender#social-networks#bonding
✶Explainer79:30
A good friend helps you and doesn't help your enemy
Krems previews a cross-cultural study on what makes a good friend. The twist question: is a friend who helps you and someone you dislike better, or one who helps you but not that person? Objectively the first is twice as helpful, but in the US people rate the friend who withholds help from your enemy as the better friend. Friendship is judged super-dyadically: how a friend radiates effects onto you, including by not helping your rivals.
- Question pits an objectively more helpful friend against a partisan one
- US participants rate the partisan friend as the better friend
- Friendship value includes indirect effects, like snubbing your enemies
- 'Nice' really means 'nice to us'; a good friend is good for us
“when we say somebody is nice we mean they're nice to us and when we say somebody is a glorious monster we mean they're a…”
#friendship#superdyadic#cross-cultural