Heritability also increased for sexual behaviors after 1960 for same reasons. Without social controls on sex, genes had less influence. 1960s countercultural revolution led to cultural deterioration--single parenting, etc--for people less genetically inclined toward self-control
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Michael Patrick Dunne, Nicholas G. Martin, and Andrew C. Heath, “Genetic and Environmental Contributions to Variance in Age at First Sexual Intercourse,” Psychological Science 8, no. 3 (January 1997): 211–216.http://journals.sagepub.com/doi/abs/10.1111/j.1467-9280.1997.tb00414.x …
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