Well it is genetic. Everything is genetic in part. Evolution doesn't work directly, or with purpose.
Part of the reason homosexuality is as prevalent as it is, is due to social suppression. Preferred behavior is suppressed and people have children who might otherwise not. Most of the world rabidly suppresses homosexuality, so these people end up having families and pass on the trait.
So to the culture warriors of the world do understand, homosexuality is as prevalent today because you intolerant jerks have gone to such extents to suppress it.
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