AFF: Well personally I've always hated the idea of nature just spitting out a bunch of traits and characteristics and everyone just always turning out predictably. In the nature vs. nurture debate I'm definitely pulling for nurture.
That's not exactly how it works. Nature (genetics) has some fixed attributes like hair and eye color which are statistically predictable. Then things become a lot less predictable. Genetic attributes become like a matrix of tendencies which are influenced by a number of factors like nutrition, conditioning and learning.
The science that we know and the science that we suspect both suggest that the mechanism of determinacy for sexual orientation is a complex mix of nature and nurture. It is looking less and less like it is purely one or the other.
LilBuddah: The whole "nature" vs. "nurture" debate is a purely political one.
You are right about this but it is a very, very loaded debate on which a lot is riding for GLBT people.
Nurture implies that sexual orientation is based on choice and is not a fixed personality attribute. Because A, B and C are present in the environment, the individual makes a decision about their "sexual preference" at some point. This theory is used by religious extremists and eX-gay organizations as the basis of their argument that gay people are intrinsically disordered and are in need of being "fixed".
The view of sexuality as a preference (or choice) rather than orientation (inherent characteristic) is seriously loaded with moral and ethical ambiguities. These ambiguities are used to justify all sorts of discrimination against gay people and, in extreme cases, dangerous "treatments" to change a persons "sexual preference".
Nature implies that sexual orientation is is not a matter of conscious choice. As sexual orientation is an inherent characteristic and not a moral deficiency, it becomes more and more difficult to justify discrimination. Anti-gay discrimination becomes akin to bigotry based on skin color.
A great many gay people, myself included, are enraged by the idea that we just "decided" to be gay. I guess I could "decide" to shoot myself in the foot but why would I do it? It would be very painful, debilitating and I would gain nothing from it. If there was any "decision" to be made, I would have chosen to be str8 and saved myself one hell of a lot of grief. If beatings, torture and being set on fire could not make me "decide" to be str8, I'm convinced that what ever mechanism determines sexual orientation, choice has absolutely nothing to do with it. [Anecdotal evidence of course but its good enough for me.]