2 well-to-do guys I know hold thong-themed pool parties, you gotta wear something, but the skimpier the better. What most guys don't realize is that a lot of this really small stuff might just barely cover you up when you are in a relaxed state, but the second your cock starts enlarging, the game is lost, and there you are, with your balls hanging out, and your stiff cock standing straight up and ready to pop out too. Boners are contagious and the sight of one guy in such a state, generates the same response by the rest of the gang. The traffic in and out of the sauna is fun to watch, guys go in with boners, come out later with everything back in control and tucked inside, more or less. Of course some guys seem to spend all afternoon inside the sauna, and the aroma of poppers hits you in the nostrils the moment you step inside. And some guys keep making return visits.
I wear thongs and g strings too in the sauna/bathhouse. In fact, it gathers more attention as my butt cheeks are showing off. It is not uncommon for me to get slapped, squeezed, caressed, touched, and rimmed and sucked. I usually lie down in the steam room and that is when my bulge show off in my thongs, or lie on my back and get guys to fondle my butt cheeks and ass. Just love teasing guys in the sauna.