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Bisexuals are natural, homosexuals are not. Homosexuals don't exist among wild animals (only one debunked study from 1996 claimed this for one species), bisexuals are common among wild animals. Historically speaking, bisexuality was normal while no word existed to describe the concept of a homosexual until the late 19th century and it was just treated as a behavior that "bisexual" people engage in.
Brains are malleable, they can change structure and shape through activities and life experiences. I don't dispute brain differences, my dispute is claiming that these differences are innate and immutable. Biology can be an influence in your personality and behavior, I already mentioned that biology has an effect on career choice. But you can't dumb it down to biology only. Twin studies show that environmental influences are a major factor in people's sexual preferences later on. As well as studies about being raised by gay parents (especially relevant to this thread). Dumbing this all down to biology is ignoring these major environmental influences.
https://pubmed.ncbi.nlm.nih.gov/20642872/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6026959/
I mentioned effeminate men because I believe effeminate behavior early on in life is what causes people to become homosexual in their late childhood since it appears earlier than sexuality does. Womb studies like the one you posted have causes for a multitude of factors, but they selectively choose homosexuality and ignore all others. This is like that "God gene" study published by a geneticist making the claim there's genes that make people spiritual. Biology/genetics influences people's behaviors to a degree, and these behaviors or feelings can influence people to become homosexual later, but that doesn't mean they straight up came out of the womb gay.
Furthermore, in the modern age, we developed these boxed in identities of "gay" and "straight" that didn't traditionally exist. Having the option to identify with these identities mentally boxes people into them and tells them that attraction to others that don't fit their sexuality spectrum is impossible making sexuality less fluid. Even gay rights activists originally campaigned based on freedom of expression and didn't use the "born that way" argument until recently as a last resort (while privately acknowledging among themselves it is a lie and viewed sexuality as at least partially environmentally influenced).
https://www.bbc.com/future/article/2...eterosexuality
Sexual fluidity and change in sexuality still happens, but much less compared to before. Though it seems to be on the rise again with the percentage of people identifying as bi specifically increasing at a massive speed.
https://www.logotv.com/news/id73b0/a...fy-as-bisexual
https://c-hit.org/2022/02/21/poll-21...tify-as-lgbtq/
Even if you just want to look at homosexual behavior (rather than modern homosexuality) and say it is just a normal feature of humanity, then it would have a relatively similar constant across history and a wide variety of cultures. But in some cultures, it's very common. In others, rare to non-existent. Historically, it also varied between being very common and much less common.
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