Is Being Gay Hereditary/Genetic?

[Aloysius]

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Could also be incomplete penetrance. i.e. not everyone who have a genetic susceptibility for cancer gets cancer.

And along those lines, homosexuality is most likely due to some gene x environment interaction, not unlike just about everything else about us.

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OOT - I thought the above statement was the general understanding of sexual preference. No?

Side-note: I just looked at the 2000 Census Bureau, and it says that 1.6% of the US population identifies themselves as gay / bisexual, from which you can reasonably infer that assuming some level of accuracy (and that everyone who is actually gay / bisexual identifies him or herself as such) that something like 2 out of 100 people are gay?

Does that seem low to you? About right?

-Al