The town I went to university in had a well established nude beach and I went there two or three times over several years. Been to a lot of traditional style males-only baths in Asia, for example in Hakone National Park, Japan, famous for its hot spring baths. No clothing in those ones. All good hotels have these baths, just as all Finnish hotels have a sauna.

A little naked 9 year old (estimated) once followed me around wherever I went in one of those Asian places for nearly an hour. Finally I went to use a urinal, and he came up to use the one right next to me (though there were at least 6 other vacant ones and no other person in the area) and after we had peed together, he seemed satisfied and disappeared. We didn't speak each other's languages so I couldn't inquire what it was all about.

It wasn't a cold, inquisitive experience, though, even though I studiously avoided any gesture that would lead him to think I was attracted to him (if I'd allowed myself to have even a faint sexual thought, the change in my body would have been obvious, so I desisted .. old trick learned in junior high school showers). I just moved to ever more unlikely spots, like the herbal steam sauna, and was surprised to see him still come in and flop his butt on the bench across from me a few moments later.

It went way beyond "just curious" - he'd seen everything in the first couple of minutes. I think we both loved each other and knew it at some level.

Onsen; a small boy
Follows me, pool after pool:
my smooth, wet echo