Answered on Queera, I mean Quora.
Many straight women have gone gay. It happens all the time. And the reverse.
However, many lesbians appear to be true biological lesbians. The lesbianism is early-onset and is often associated with a masculinized female. I’ve studied many of their histories, and it looks biological somehow.
Straight and bi men cannot change their sexual orientation, at least after age 15. Before that, we do not know. I know of one case where a boy went from straight to gay between ages of 9–11. However, choice may not have been involved. Males may be able to somewhat change orientation in childhood, but this is a black hole of theory, as it is never studied.
Some straight men have chosen to live a gay lifestyle, mostly because females have seriously rejected them. This is maybe 5% of gay men, if it is even that high.
Also quite a few straight men choose to engage in varying amounts of gay sex. They prefer women, but they have sex with men on a lesser basis for a variety of reasons. They are simply choosing to do this. Why any straight man would choose such a thing is absolutely beyond me. Among the crowd I grew up, there would be nothing worse than for a straight guy to do such a thing. It was the ultimate taboo.
The number of straight men who have chosen a gay lifestyle must be very low.
Most gay men, 95%+, are biologically gay. They got wired up this way, probably in the womb due to hormonal fluctuations. They had no choice in the matter.
If you have read this far, you can see that sexual orientation is different from sexual behavior, and they do not always line up. Straight men can absolutely choose to engage in gay sex! They do it all the time. But their orientation does not change.
