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Weird: more gender equality correlating with not less, but more psychological gender differences:
"high gender egalitarian nations also exhibit larger sex differences in Big Five personality traits and the Dark Triad traits of Machiavellianism, Narcissism, and psychopathy; in romantic attachment and love styles; in sociopolitical attitudes and personal values; in clinical depression rates and crying behavior; in tested cognitive and mental abilities; and in physical attributes such as height and blood pressure[51]. If the sociopolitical gender egalitarianism found in Scandinavian nations is supposed to produce smaller psychological sex differences, it’s not doing a very good job of it."
My tentative hypothesis: the less difference there is, the more important it becomes to signal it. More weird stuff in the article.
https://evolution-institute.org/article/on-common-criticisms-of-evolutionary-psychology/
Here is the cited paper.