If straight men are not aroused by other men, why do they do things like strip a boy?

Straight men do not accept their sexual feelings for men. And it is because they are only too aware of the strong social mechanisms, especially that of Sexual orientation, developed by the heterosexual society, that will isolate them out of the men's space (straight) into the third sex space (gay).

But their sexual feelings come out when there is an excuse or a traditioin, and there are no women around, and it is their space, men's space -- without the formal society's presence. Then the boys let go of their sexual feelings and indulge themselves, although not fully, but still -- considering that they are not supposed to have any sexual feelings for men at all, a lot of their guards does come down.