With that relatively modern constraint on human "natural selection" in mind, you may be interested in reading or re-reading Totem and Taboo.

Freud's theories of repressed sexuality and suppressed incest aversion among Victorian individuals, drawn from the patronizing ethnographic monographs of the day, appears to me very much alive in eurocentric fixations with "legitimate" offspring, over-population, proprietary claims to female reproductive capability, M/F genital "mutilations", so-called sexual revolution.

"Meme" to think of the next time one "consumes" fertility statistics.

Diversity is the key to economic and political evolution.