Yeah, it's just a big discomfort party, and everyone's invited

. The straight guys are terrified of being looked at, or that anyone will think
they're looking, the not-straight ones are either terrified of being caught looking, or think they're
expected to (or just
are or
aren't looking, of course). So every time you walk into one of those places, you're participating in a collective counter-transference psychodrama that's been centuries in the making :-/
Personally, I can't imagine getting that curious while I'm taking a leak - I mean, I selectively love cock, but let's face it, the last place that's going to make me feel horny is a stale-piss-perfumed box full of strangers. Go figure.