Re: How can gayness have a genetic basis?
Focus more on this part:
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This could be passed by the lesbians, who still had to procreate with their male. Which would be likely in this scenario because polygyny is heavily tilted in reproductive favor of the female.
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As for the part you quoted. You are assuming its binary with your reply. There is no reason for this assumption. Could be non-exclusive genetic states for both a) want to do womens, and b) want to do mens.
As for group selection thinking I stated it wrong. It actually would work that the homosexuals would get a long better in the polygynous society because they are less sexually frustrated. The frustrated strictly hetero female may be selected against due to her behavior not being tolerated.
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