I’ve been several times both for men-only and coed days. Men only is clothing optional and, while it’s not technically supposed to happen, every time I’ve been on Sundays or Thursday for men only, there’s plenty of action happening.
That said, it is a great place for a traditional schvitz and they have massage, platza and body scrub options. It’s also not a quiet place, so often lots of talking & conversation happening.
Worth a visit.