(Im)mutability of Same Gender Attraction

[All-American]

It occurs to me that one of the important sub-themes of the whole discussion on Same-Sex marriage is the degree to which same-sex attraction is mutable. If same-gender attraction cannot be avoided or overcome (and not merely unhealthily repressed in a manner that causes severe anguish to one who experiences it), then to resist it is senseless. If all who are homosexual are, were, and ever will be homosexual in spite of any pressure or influence to the contrary, there's no sense fighting it.

But as I stop to think about it, I can't recall reading any studies claiming either mutability or immutability of same gender attraction. I've read plenty of studies that suggest genetic predisposition, but not whether environmental factors contribute. Are any readers here aware of any studies that suggest the either mutability or immutability of same gender attraction? If so, cite here, please. I'd be interested to see which side of the coin the inquiries suggest is correct.

And, if I may, I would kindly request that we leave most of the bickering that characterizes the other threads on this matter there, and reserve this particular line of thought for honest and thoughtful evaluation. Let the evidence itself speak its own volumes without interruption.

Thank you.