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[–] Bilbo_Swaggins ago 

You should read the study, it's good. In any case, the genetic observation doesn't rule out the environmental hypothesis for two reasons:

1) The supposed gay gene, which we have not discovered, may not have 100% penetrance. So it is with the Alzheimer's gene: having the gene makes you more likely to get the disease but it doesn't mean you will without a doubt, and you can have the disease without the gene.

2) If epigenetic factors are at play then someone with methylated DNA will be more likely to have gay kids. This constitutes an environmental factor for the parents and a genetic one for the kids.

Most likely homosexuality lies at the confluence of genetic and environmental factors imo.

Anyway, if women with the gay gene have tons of kids then it'll get passed on even though the men who get it don't have kids. And the mothers and aunts of gay men are more fertile.