Just get chatting to other guys and if you are lucky you will get a massage. Or offer one to someone. It’s very relaxed. Many massage nude, some guys keep their shorts on. There aren’t really any rules, just don’t go wanking off. This place isn’t a gay sauna, just a great place to hang out nude with other guys
Nice! Was the place dimly lit? Can you actually observe the entire massage without coming across as rude? Did you see the masseur touch the cock of the person getting the massage?