I do know we had the conversation with the gays in question, my wife and I know them very well-nown them for 55 years and 35+ years, they know we are not anti gay or anti marriage which would skew their answer. None of them said they were abused ever. Yes, many gays have been abused but most have not.
Since you seem to favor the observation POV... I have known two gay fellows, both neighbors at one time.
One (John) was raised an only child by his aunt, mother died at birth, father an alcoholic died while John was around 4 or 5. Left with money from selling the family business, John was smothered in a cocoon from then on. He was not allowed to go outside and play, he only interaction with others was piano lessons and school. He was dressed in fancy garb day in and day out making him target of kids in school. He had no understanding how to cope with other children so he sunk further and further into his own little world. He once on valentines day asked his aunt for a box of chocolates for a girl he fancied at school. This backfired on him in ways kids can be cruel, she taunted him and her friends taunted him for daring to approach her in such a manner. Then the guys sensed his weakness and taunted him. He never got over that as far as I could tell. He just slipped into pretending to be asexual from that point on until he graduated and moved off.
Case Two. Chris (and Chris B).
Chris came from a wealthy affluent family in the community. Mother was sweet-natured Christian socialite who had her hand in about everything, Father was very busy businessman in the hosiery industry who had little time to devote to carefree son. Chris was the third child born very late behind his brothers. He was also basically left to be raised by his mother who left him to his rich playboy lifestyle in a small town. He was not very athletic but well liked because he drove the best cars, had blow dough, and drugs. Plus having two big brothers in a small town tends to keep the bully part down. Chris went wild basically, but managed to keep most of it hidden from his mother whom he did love. Chris found a friend in another fellow (also named Chris) that fancied himself (We will call him Chris B) a budding actor. I don't know a whole lot about the other Chris (Chris B) because he was not a neighbor, but he seemed to be not rich and enjoyed the company of rich Chris. They often would spend their time visiting people in the play acting business in a nearby big city. The two of them became gayer by the year. Both died of aids years later, both had numerous partners over the years.
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Do I believe homosexuality is science (just happens)? No. It was a learned behavior over time. Rebellion in one case, fear of failure in another. Mental issues.
But if you can find the gene for it, lets us know, I am sure those for abortion would love to check before having a baby to abort it so they can have grandchildren.