I find this very common at sporting events and some clubs where the men's room has the door propped open or has no door and ladies seem to linger outside. Some waiting on boyfriend/husband and some who just seem to be standing there usually messing with their phones. I'm not hung but I show them what I got.
I notice this too at big events. I was at a new year street party which was probably attracting about 100,000 people. They had toilets set up in some locations, but of course it's never enough and the lines were so long people were waiting an hour or so to get near a toilet. They probably had about 1000 toilets set up around the place. Clearly at an event where alcohol was flowing, that was a recipe for a lot of full bladders. The cold weather didn't help much either. I saw lots of pee-pee dances going on.
Not wanting to spend an hour or so away from my friends waiting in a line, I quietly slipped behind one of the catering trucks to take a piss. They had boards up to try and stop people from doing so, but realistically you couldn't stop that. I wasn't the only one with this idea, the area behind the trucks was just one long line of guys and girls pissing against a wall. Anyway, I was standing there, when this guy came up, dick already out and actually heavily peeing before he even got to the wall, such was his desperation. He was fairly drunk, but went on to tell me he had waited in the line for so long he just couldn't take it any longer. Not even 5 seconds behind him was his gf, who was in just as desperate a situation. She dropped her trousers and panties and before she was even in the squat position torrents of pee started to burst out from her, which steamed up as it was so cold. Neither of them seemed to mind that people were staring at them, they were making no attempt to be discreet, the girls moans of sheer relief and the sound of her stream hitting the pavement were enough to turn lots of heads in our unofficial toilet area!