Further data concerning Blanchard's (2011) 'Fertility in the mothers of firstborn homosexual and heterosexual men'.

摘要

Blanchard (2011) reanalyzed previously published data to examine the balancing selection hypothesis, which concerns the persistence of male homosexuality. This hypothesis is based on several findings suggesting that male homosexuality is to some degree heritable (LeVay, 2011). However, since homosexual men are less fecund (i.e., produce fewer offspring) than heterosexual men, some compensatory mechanism must exist. The balancing selection hypothesis states that the decreased fecundity of men who inherit a genetic contribution to homosexuality is counterbalanced by an increased fecundity of their relatives carrying the same genetic variants (Hamer & Copeland, 1994).