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is homophobia associated with homosexual arousal
(lemmy.blahaj.zone)
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I can think of multiple reasons a straight man could get aroused by seeing a dick.
First, erections don't occur only because of arousal, they can happen from adrenaline as well. I guess if you're a homophobe and are about to watch gay porn as part of research, you might get a bit of adrenaline.
Another reason I can think of is that most straight men see a dick when they watch porn, meaning their brain may make the association of "dick on screen = some hot nude lady is gonna show up".