there was a theory that the genes that confer gay men also confer extra fertility for women (and twinning). So keeping the genes in the population via other mechanisms. (I think the research was in Italian families, no link sorry.)
Aside from the inclusive fitness claim, Cochran's gay germ hypothesis is also consistent with the continued existence of homosexuality: the pathogen co-evolves and so while the genes do get selected against, which genes keeps changing. Unfortunately, his theory still remains something of a 'germ of the gaps' theory - no one's come up with a remotely plausible theory or found decent evidence that homosexuality spikes the fertility of relatives so much as to compensate for the sterility of homosexuals (remember, inclusive fitness decreases fast: if a homosex...
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