this is how it works: men and women are in and out of relationships in their 20s, but since there are 3-5 men for every 1 woman ever actively seeking relationships, that means you get situations where many men spent 2-3 years of their 20s in a relationship, and an equivalent number of women spent 7-8 years of their 20s in a relationship. this completely shifts the culture and fucks up reciprocity and trust between men and women. the behavior sink is when this gets exacerbated by declining female libido and accelerates as women gain more and more social and cultural control in resource abundant environments. it's not necessarily always going to happen, because it's a sociological layer on top of biology, not some epigenetic or materially deterministic outcome.
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