Originally posted by MikeH
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By that I mean in the animal kingdom or among humans (although it is harder to isolate among humans due to the strong social component).
In the animal kingdom we do see evidence for genetic 'on-off' homosexual/heterosexual switch. The 'bisexuals' of the animal kingdom are the animals which do not have 'life partners'/etc, the ones who strongly chase after sex (doesn't have to be same species even) the most easily identified animal being the dog. This is obviously a different effect on top of the homosexual/heterosexual part which is observed in incredibly diverse animal species.
Additionally, with humans these 'risk' genes are not only associated with sexual partners of both sexes, but with other 'risk' behavior (often not sexual). Which is why it is 'risk' genes and not 'bisexual gene'.
I mean, one could speculate that there was a genetic spectrum component for what age you found people to be sexually attractive. But there isn't any support for that. Same with there being a genetic spectrum component for sexuality.
And as I said, we are social creatures and which has (arguably) stronger impact than our genetics.
JM
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