I'm very interested to learn
@Larry David's Crypto Fund official stance on this, as they're one of the main posters that hangs around whenever this question is thrown.
Males and females are different, have different evolutionary drivers for their sexual appetites, different vulnerabilities, different physiologies. So it tracks that the origin of homosexual behavior differs between men and women, on a population level. It is abundantly clear looking both at studies of humans and animal behavior that there isn't a singular cause of homosexuality that applies to both males and females. This right here should tip you off to the fact that you're never gonna find that "gay gene" because there is no such thing.
The most compelling "born that way" evidence has been in males and it isn't very compelling, nor does it point at a genetic cause. It does point to the possible role of uterine environment (hormones and antibodies) but given the "youngest of many brothers most likely to be the gay one" hypothesis hasn't been able to do something like an adoption or twin study, you still have to wonder about the social aspect- having 3 older brothers exposes you to all their friends, most importantly, and the odds increase that one of them is friends with a boy who is a diddler.
Male sexuality has a drive towards prolificacy which makes evolutionary sense, and explains why things like "prison gay" are so common. If you throw enough seed around indiscriminately, some of it will probably take somewhere, after all. Female sexuality has a drive towards stability and social conformity- which is why they'd ship wagon trains full of women out to get the 49ers to stop being prison gay and drinking all day, and why women can so easily psyop each other into sexual fads (ROGD is a current one), and sometimes resort to just Uhauling and bed deathing with each other instead of trying to find a good man.
If there were honest scientists doing honest work on this question I think they would come to find the following combination of factors:
1. Deranged view of the opposite sex, caused by abuse, fatherlessness, or other social factors.
2. Hormonal disturbance caused either by a disorder like PCOS or by exogenous hormones (birth control).
3. Cultural or subcultural status attached to the homosexual role. (ie an artistic man might find the "gays are more artistic" thing subconsciously attractive, smart girls might be drawn in by the idea that lesbian feminists are the ones who have it all figured out...)
4. Other psychological or psychiatric vulnerabilities that predispose a person to being overly influenced by the above.