Asymptotic condition: homo sapiens forks into 2 symbiote pseudospecies, non-breeders reproduce memetically, breeders breed at replacement rate for both, non-breeders contribute to biological inclusive fitness by doing info-work embedded in the big stack that sustains the breeders
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% of 18-30 year olds reporting no sex in the past year
2008
Women: 8%
Men: 10%
2018
Women: 18%
Men: 28%
washingtonpost.com/business/2019/
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