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There is no evidence to suggest that homosexuality is genetic. Even when you think about it, it seems almost contradictory: Those people in whom the gene manisfested itself, would not pass on the gene. Hence it could only be passed on, if it were to lie dormant!
My guess is that it is an error in the embryonic development, at the stage when the embryo "decides" to be male or female. And instead of becoming purely "male" or purely "female" it takes on characteristics of both.
This seems to fit the evidence. Homosexual men tend to have soft, feminine facial features, and their personality also tends to be more feminine, as do their interests: fashion, art v.s beer and sport. This is perhaps why homosexual men often get on so well with women as "one of their own" (And yes I am WELL aware that I am making massive generalisations and sterotypes).
Homosexual women tend to have "butch" masculine features. They tend to be more well built, with larger muscles. (Again with the stereotypes).
This could also be the reasoning behind transvestitism and transsexualism.
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You acknowledge your reasons as being sweeping generalizations and you still hold onto the view depends on those reasons.
To the general idea of the rest of your post:
A person's default sexuality seems to be bisexual-whatever generates pleasure is okay. There's precedent for this in nature and in history. In greece, rome, etc., bisexuality was popular amoung men. Homosexuality also occurs in nature and Dolphins, the only known species to have sex for pleasure, also engages in homosexuality.
It, of course, is changed through nurture especially in our soceity where homosexuality is generally disaproved in.
There doesn't need to be a "homosexual gene". You've got a gene that tells you to like male or female. Sometimes they may just get mixed up.