Reading a comment like this I mainly think "wow TV and social media have really f-ed up young people these days".

Back in my high school days, we had some bathing events and also shared sauna. One could either voluntary use the nude beach, or walk a bit and go to an outdoor pool with proper changing rooms and dressed people.

I think the split was roughly 50/50 and there also wasn't much gender skew.

But that was a time before smartphones. When people still walked over to each other's house to hang out.