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it suggests that biologically, men are not repelled by homosexual relationships. It's only the social stigma that has been drilled into us from an early age that makes distaste for same sex unions to be inherent.

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I would also never ever fuck a guy in the ass with a strap on, because that would turn me off immensely.

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Would you be turned off because of a societal stigma or an inherent physical aversion?

I'm guessing the later, and thus, your quandary about men's aversion to same-sex capers is resolved.