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Originally Posted by The_voice_of_reason
I mean it can't be genetic How would the genes get passed on?
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Actually, it can. Allow me to explain:
Lets say that gene H is the dominant straight gene, and gene h is the recessive gay gene. Although there are possibly multiple genes accounting for homosexuality and bisexuality, I'm simplifiying it for the sake of clarity.
Now lets suppose that we have a person who has the Hh combination. The dominant H gene would cancel out the recessive h gene, making the person heterosexual. Now lets suppose that the Hh individual mates with a person who also has the Hh combination. We are left with four possibilities: HH (heterosexual) two Hhs (heterosexuals who carry the h gene but are not gay because the gene is canceled by the H.), and the hh individual, who has two reccessive genes for homosexuality and thus is homosexual.
Hh+Hh=HH, Hh, Hh, or hh.