I lived in SanFran for years, and had many gay friends. I’m quite sure that some were born gay and others chose it as a lifestyle. Alan Jones, the dean of Grace Cathedral, gave a really interesting sermon about the difference between discovering one’s sexual identity and merely experimenting around with sexual preference. He was not well received that Sunday.
One handsome, intelligent young man with AIDS told me that he’d spent his years at Princeton outside the library men’s room, going in with anyone who wanted him. When he became HIV positive, he began going to workshops for gays who wanted to become straight. Not that it would help save his life, but he wanted to fully understand his behavior and take responsibility...he discovered that he really could have loved women all along. He was dead within a year. Very sad case. His grandfather had been a prominent general in WW2; his family totally abandoned him when he became ill. I was sort of his stand-in mom who would listen, and I treasured our friendship. He was hideously ill at the end. I don’t know how his family could remain detached.
My example is the best friend of a friend of mine. A New Yorker, lived an incredibly licentious gay lifestyle for about five years at all the New York bathhouses, was extremely lucky to have opted out before AIDS became rampant in the gay community by the late 1980s, and today is a 52-year old with two children. I don't think his wife or children know about his lifestyle back then.
Dennis Prager has documented that homosexuality, at least amongst men, increases significantly when society's morals drop. The reason is that men will switch over if the sex becomes easy and there is no more disapproval.