I know this may sound weird, but I don't necessarily think this is an LPSG thing. But it does seem to be a str8 guy thing. As a gay guy, I've always been amazed how many str8 guys automatically assume that all gay guys REALLY want to see THEIR cock. Or suck their cock, or hold their cock or whatever.
And, I'm not talking about hung or even attractive guys. Just amazed though that so many str8 guys just assume that their crotches are somehow the pot of gold at the end of the rainbow and that gay guys (and I'm sure for some, women) must just walk around spending their days hoping for the chance to get their eyes or hands or mouths on it.