Re: How can gayness have a genetic basis?
Bonobo chimp males regularly hang from a branch face-to-face and engage in "penis fencing". And every member of the tribe engages in sexual activity with every other one (female-female, male-male, male-female), except mothers and adult sons.
That's what I read on Wikipedia today. Clearly for the bonobos it has a role in group cohesion and bonding. I don't know but I'd guess that for bonobos it's not just a cultural thing.
As for humans, I'd like to hear more about the twins-separated-at-birth studies - forget any of our hypothesising - these would pretty much give a simple answer.
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