"as we all know from all the scientific evidence, every male is homosexual whether or not they have never been with another dude or had a sexual attraction to another dude." Tongue in cheek I know, but if a guy is straight 100%, then he is straight and IMO the OP here is seeing more to it than there really is, with due respect to the OP. Someone gave an example of a guy taking off his towel above. Even a straight guy might look at that and say to himself holy f**k, but have no sexual interest in it. Just a guy in the locker room being close to the largest or the largest he has seen. I think even straight guys, while they have no interest in other guys, would take a look at that towel open and wish they had equipment like that! But don't put more into it than there is. He could simply be an exhibitionist as well, proud of what he has and thinks everyone else will be too.