i agree, it's only an issue of you think it is one.
i suppose people watch porn and fantasize about things that they would never actually want to enact themselves. i mean, when i watch porn i get turned on by group sex. but i would never want to be involved in group sex myself. do you see what i mean?
fantasies are just that. fantasies. it can apply to all other areas of thought and imagination too. have you never imagined being famous, or being a rock star, or imagined if you killed yourself; your funeral and all your friends weeping and saying what an amazing person you were...? lol. it doesnt mean you want to be famous, or that you want to kill yourself. it's just you using your imagination, i guess!
i don't think watching gay porn neccessarily makes you gay. but it wouldn't matter if you were anyway. just go with what feels right, go with the flow, don't worry about it!