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knb comments on When does heritable low fitness need to be explained? - Less Wrong
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Homosexuality has a low heritability, IIRC something like 20% concordance for identical twins. If there was a gay gene you would imagine it would be higher.
Greg Cochrane:
Yes, that was one of the reasons I posted this. Wikipedia says even identical twins that share a placenta can differ in sexual orientation, and you don't get more shared-genes-and-environment than that.