I remember when, as a kid, our YMCA transitioned to suits required in the pool. WOMEN had invaded the YMCA. We protested by taking off the suits while we had open swim times. The men tried to hang on to the tradition as long as possible as well. Of course it was a losing battle. Now we face the requirements of clothing in the Steam and Sauna, Whirlpool if single gender should also be nude. You can guess who no longer had a YMCA membership. Pity as it was one of my favorite experiences as a kid.
I'm a member of the Brooks YMCA in Jacksonville, FL and we have to wear a swim suit in the whirlpool and sauna. A lot of guys wear boxer briefs and once in a while a guy will wear just a towel in the whirlpool, but the daytime locker room attendant will threaten to have you thrown out if you don't wear a swim suit. He also gets after any guys wearing just a towel in the sauna, but most just ignore him. There is some nudity in the locker room, but I often get funny looks walking naked between the locker area and the showers naked. They are in different rooms across the hall from each otherand most guys wear at least a towel, but a few of us go naked which should be normal!