I hope I'm not ignorant about things here, but it seems to me that almost all homosexual men are born gay. Most lesbian women seem also born gay, however it seems in addition to that, other women make this choice themselves as they get older, to be with another woman as opposed to a man, usually due to bad experience with men and wanting to be with someone more similar to themselves. This sort of woman will sometimes go back to seeking males. I haven't seen the same thing happen much with men, although bisexual men usually choose one way or the other in midlife and tend to stick to it.
is there any evidence that men EVER 'become' homosexual due to 'nurturing'? I haven't seen this. let me know if you know otherwise.
That people are born gay has always been obvious to me. That they can never have a companion has always been a cruel idea to me. Born to be lonely forever! that is what is unnatural!