Still he hasn't backed up anything, not even a study that could suggest he is right, we have told him that if his opinion was right, then many gay people would succed in making themselves straight, yet they don't, so his opinion must have a problem right?
I can't debate Blitzen's opinion, since I apparantly don't fully agree with it. However, I do believe in the possibility of homosexuality being partially cognitive, so I'll base my argument with that point in mind:
Let's assume, for the sake of argument, that homosexuality is cognitive. Now, some cognitive traits are reinforced by chemical ones after the initial "choice," for the lack of a better word (it doesn't have to mean an instantaneous conscious choice; it could be a by-product of other choices or even a by-product of the environment), so it becomes more difficult to change the behavior after a certain period. I'm not saying that this is actually true per se - but that is certainly a possibility.
Another possibly explaination would be that homosexual people have psychological barricades to changing this behavior. For an unrelated example used merely to illustrate, consider psychological association. Once a person learns to associate one thing or behavior with another, Psychology has shown that it is very difficult for an individual to remove the association on his/her own; his body simply associates one with the other, and rehabilitation is required to remove the association. The explaination could possibly apply to homosexuality in a slightly different manner; once the "choice" (again, for lack of a better word) is made, the brain becomes imprinted with the notion of associating same gender with lust, which is a subconscious quality that cannot be removed without psychological rehabilitation.
Both of the above are conjectures used only to show why it's
possible for homosexuality to be cognitive and for those people to not succeed in changing their attraction.
Also, since people seem to hate it when I throw the word fallacy around, I'll link to this
interesting little article. It's not proof or conclusive or anything; it merely discusses psychology's explaination for why brothers and sisters are not attracted to each other, which - in the same light as the other arguments made in the thread - suggests that attraction can also be affected by cognitive reasons.
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Okay. If you're that frustrated with the argument, I'll just drop it and say that you win. It's derailing the thread anyway, and I myself would rather continue the debate than attack/defend certain members as guilty or innocent.