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In historical patrilocal societies where women lived away from kin, they needed to build trust with other women. Expressing a shared dislike for men served as a "girl's girl" signal, fostering alliances and loyalty. Research shows women who are "guy's girls" are less trusted by other women.

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Men's tendency toward large-group dynamics fosters competition and system-building. Women's focus on one-to-one relationships, rooted in the mother-child bond, cultivates intimacy and emotional expressiveness. These distinct social orientations help explain many psychological differences between the sexes.

Historically, women who signaled vulnerability and need through sadness were more likely to receive assistance and resources. This evolutionary framework suggests a biological basis for women's globally reported lower happiness levels compared to men, as communicating need was a survival advantage.

Much of female fashion and beauty effort is a form of intrasexual competition. It signals status to other women and serves a "mate guarding" function, as studies show men are often less discerning about the nuanced differences in high-status attire.

The speaker introduces "mate suppression" as a twisted biological impulse, particularly prevalent in toxic femininity, to harm the reproductive chances of perceived rivals. This drive manifests in behaviors that sabotage others' attractiveness or access to mates, explaining seemingly irrational social rules that secretly aim to handicap competitors.

Women compete intensely, particularly for mates, but often use indirect social tactics. An experiment showed women were more likely to spread negative gossip about an attractive rival, but they strategically framed the damaging information as concern for her well-being.

By branding traditionally attractive masculine traits like dominance and aggression as 'toxic,' women can manipulate the mating market. This sabotages rivals' ability to select high-quality partners by steering them toward less desirable mates, thereby inhibiting their reproductive success.

Contrary to popular belief, women's elaborate grooming and dressing are often not for men, but are intrasexual signals of aggression, dominance, and social status aimed at other women. An attractive woman signaling this way is seen negatively by rivals.

Women may have evolved to signal vulnerability to evoke care. This can translate into a political preference for systems that transfer resources to the vulnerable, a group they may see themselves in. This preference helps construct a social world that aligns with their evolved interests.

Women can deliver negative gossip without social penalty by framing it as concern. This 'bless her heart' effect makes the information seem credible and the speaker appear virtuous, effectively disguising competitive derogation as prosocial behavior, a tactic that does not work as well for men.

The "having a boyfriend is cringe" trend, promoted by high-status women, may be an unconscious evolutionary strategy to suppress the reproductive success of other women, thus reducing competition for desirable partners.