Individuals who grew up in lesbian families were more likely to show same-sex attraction and behavior themselves. https://link.springer.com/article/10.1007/s10508-019-1434-5 …pic.twitter.com/FOYNLG7FyA
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Fathers to children of lesbian mothers might also be more likely to be gay. I know many cases where lesbian mothers used gay male friends as donators.
That is indeed interesting. Should have been taken into account in the study, if true.
What about the origin of heterosexuality?
Well, that is the default model. In need of explanation are any variants that would tend to reduce Darwinian fitness, the occurrence of people's genes in subsequent generations. But I know that some are upset by THAT kind of thinking.
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