I think part of it is that the bathroom feels inherently a bit of a refuge. Like if you've snogged someone and you're not sure how your lipstick's holding up? Bathroom. If the waistband of your tights started rolling down during dancing, then off to the bathroom. Even if I'm just going in for a pee, there's a sense of relief when I enter a nightclub bathroom, not least of all because it's usually quieter.

Sometimes I might go to the bathroom just for the quiet and some cool water on my wrists, and usually there'll be people hanging out there, either waiting for friends, or reapplying make-up. I think it's a self reinforcing cycle, where because the women's bathroom is a social space in itself, then that makes it an acceptable place to just hang out for a breather, making conversation with random people there. With men's toilets however, there's no-one to strike up a conversation with really, because it's a quick, in and out procedure, and thus it would probably be seen as weird to be hanging out there