A gym I used to belong to in CA was great. It was actually a raquetball club/gym. Anyway, there was a hot tub just off the showers in the mens locker room. You could sit in there and watch guys shower and they didn't know it. I could be jacking off and did while I watched. Sometimes, they'd come sit in there too. I never played, but I did get off there a lot. The showers were just open showers. I prefer those!