Apart from sexual partners, quite a few men and women, at nude beaches - the only kind of beach I go to - gym showers and saunas. It often happens when it's warm and I come out of a sea bath: with few people there I don't care and walk out, with immediate attention from women and some disappointment from some men, but if the beach is crowded I just have a U-turn and go back into the water. Other funny time I remember was 4-5 years ago, I was on Cialis and was enjoying a nice walk on a desert beach while hard; suddenly I realized that it wasn't so desert there ...
Gym showers: not so long ago, I was alone and enjoying a nice warm shower - hard as a rock, wow ! - then suddenly the service man came in for cleaning, and he was very warm and over-enthusiastic with me.