I’m not sure that there is a simple Yes or No answer to this. My gut feeling is that for most the answer is probably “No”, but that there are some who are enough “in the middle” that they can kind of go in either direction.
Simultaneous post, to the second, with the same point.
That’s not easy to do.
I’ve seen a lot of married men suddenly claim they are “gay”. Of course, they all say they’ve always been that way and were living a lie, but a lot of women seem really shocked to find out their husbands weren’t really attracted to them, so who knows?
On the female side, there is a LOT MORE ambiguity, with many “lesbians” actually claiming they are bi-sexual, bouncing back and forth between male and female relationships. The physical contact is pretty much the same in either case, so that’s not an issue, it’s just what the woman can find herself tolerating.
We read about women “discovering” they were lesbian in their 30’s. That suggests it isn’t something you are born with.
I think people can be trained to be attracted to anything, and a lot of “gayness” is people who just become too withdrawn to the opposite sex, and find it easier to be attracted to people of their own sex.