I stopped in a different location of the gym chain I went to (Bally's Total Fitness, that's how long ago it was) because they had a masseur on staff. I was early for the massage so I jumped in the hot tub, naked. It was in the open pool area but this particular location alternated men & women on different days, so just guys out there. A few minutes later one of the employees came by, clapped his hands, and asked "Everyone got their bathing suits on?" I guess one of the members complained.
A couple other locations of that chain were pretty "active" :-) Co-ed so they had saunas/steamrooms in the individual locker rooms, I got lots of action there.