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nah, if you don't also wank to men men, then you're probably not gay, you're just a degenerate.
sexual arousal is a bit more complicated than simply cocks and vaginas. people also get off on domination or being dominated. people also get off on breaking taboos.
this is why a lot of cultures, historically and contemporary, have defined sexual roles less in terms of men and women and more in terms of penetrator and penetratee.
this is also why most instances of prison rape aren't really gay. without access to women, the rapist is just 'making do' with getting off by subjugating someone and making them his bitch.