[quote name='Sarang01']Ok you mean to tell me that the mannerisms of gay men being what you'd usually see in a female is just a coincidence? Doubtful.[/quote]
I must have missed the part where all gay men had female mannerisms. I've been asked out by 3 gay men, once on the street, and twice in coffee shops. None of them were stereotypically gay. And I've known homosexuals that did have some stereotypical mannerisms, and I've known some that did not.
The most stereotypically "gay" guy I've known wasn't gay at all.
Also, if you read about previous gay culture (ie. 50's and back), you realize that much of it involves social expectations.
I'm not disagreeing with you completely on the environmental quotient, SOME Gay men didn't just always feel Gay, some were influenced by environment unfortunately and I don't mean if they had Gay parents either, I mean by such things as opposite sex rejection early in childhood as one example as well as borderline inappropriate touching from childhood to adolescence by the same sex.
I'm not aware of anything suggesting rejection by the opposite sex or inappropriate touching being linked to homosexuality. Now, if you have someone who is bisexual, or at least has bisexual tendencies, then of course that can play a role. But the attraction was already there.
Biology alone does not explain homosexuality. But environment is not as simple as many assume. Environment plays a significant role in biology, to the point where someone may be born biologically male but, due to the lack of testosterone in the womb, they are born female. Sometimes a change occurs at puberty, but not always. That is the result of environment, not genetics, and is considered an environmental influence.
Another environmental influence is seen in the amount of handling and affection shown towards children, which studies indicate may play a role in increasing intelligence. Again, environmental influences affecting biology.
No one really knows why some people are homosexual. We know there are some biological differences that are seen in many homosexuals (not all), but we don't know what causes them. And we don't know the degree to which environment plays in it. All we know is neither explain it fully.
Saying it's environmental, biological, social etc. does not imply choice.
Also, very few things are controlled by single gene. Most things are polygenetic. And I don't know of any evidence suggesting homosexuality is an expression of transgenderism in any sense.