The two people that I knew as children who are gay had their gender/sexual identity messed with when they were very small. The people who I know that have been seriously confused ditto.
One of the children was my step sister. My step father couldn’t handle having three girls so he always let the middle one know she was a good as a boy. (I came around years later). I mean the guy had real issues. The other was a grade schooler who really wasn’t a very tough guy and his father constantly berated him for it and compared him down to his brother who oddly enough, was tough enough to chew glass.
I have met adults who have vacillated and then gone to therapy and some have resulted in being straight living and some gay or lesbian. I have met unwaveringly gay people who say nothing significant ever happened to them and I believe them. I don’t really buy the hotdog and bun theory and find it a pretty undeveloped theory. Not that mine are much better. So as for biological causes. I think that homosexuality is tied to dominance and submissiveness that are part of situational social orientation from our animal nature and not deviant as such and probably not not deviant when homosexuality occurs as the dominant orientation to an individual. Not anymore than it is deviant for people to be born with recessive hair color or one blue eye and one brown, as sometimes is the case. So it may or may not be “genetic” but might be a logical and unavoidable result on a percentage basis. Seems like history bears that out well enough. Should people with red hair or one blue eye and one brown be allowed equal rights?
For those who might be offended I really, really don’t mean offense. I hope that shows.This is the best way I know how to discuss this topic given my limited experience, and hopefully, open minded observations and studies.