Re: How can gayness have a genetic basis?
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gay-straight sexuality scale
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I think both this and the binary notion are both do to our current societal structure. I find it much more plausible that there are two separate traits. Desire for same sex, and desire for opposite sex. Which would mean that desire for same sex nooky would not diminish reproductive drive.
There is so much bisexual behavior in our history and even today's world that I would be surprised if it weren't more common than one or the other.
As for nature. I could be possible that both these traits respond differently to your hormone balance/whatever else.
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