I'm a sauna/steam room guy who enjoys messing around in there, BUT... I always go in with a towel wrapped around my waste. If everyone is mega Victorian, the towel stays on. If a few guys keep coming back for more, I'll unwrap the towel and let them take the lead. Towels get loosened, there's your signal. Nothing happens, there's your other signal. If genitals get exposed, invariably mine get itchy. If theirs do too, well, it's time to do a little discrete stroking. That's basically it. I don't want to offend anyone. But I don't want to miss a golden opportunity either.