when I first wondered ...I would get completely naked put on some gay porn or look at pictures of athletic men ...when I got hard striaght away without touching myself and eventually fapped off to it ...I realised I was definitely bi and when I realised that women no longer had the same effect - I realised I was probably gay ...but its personal - we're each on our own journey

try watching some men in action or looking at some pics and see if you get hard over it - I dont think a striaght guy would

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