In my late 30s I found a bath club in Toronto called the cellar. It is not the poshest place around but the action there was always pretty hot. On entering the place you had a choice of getting a room or a locker. The lockers were near the front of the building as were the few showers. Some right in the shower room others in the hallway beside it. Also near the front was a movie room which showed porn 24- 7 with about a dozen chairs and a large TV screen showing the movie. There were also a couple of saunas both of which were quite small with room for only a few men in each.
The rooms like a lot of these places were sparse with only locker and a bed. Running front to back of the space there were 3 corridors. One along each wall and one down the middle. There were also 2 cross corridors and an area near the front one of these was set up with a few cubicles with no doors on them but glory holes between them and the ones through the thin walls. Although it was not bright anywhere in the cellar there was enough light up in this area to see some guys blowing others through the glory holes from time to time.
As in most bath houses those who had rooms could either close the door and have privacy or leave them ajar to see who was wandering by. If they were interested they could wave the person in or shake their head no if they were not. Sometimes though not often there were men there who would leave the door open while they were playing with each other providing a view for whoever happened by and sometimes more than just 2 would be going at it in the rooms.
The back hall of the space was a dark room and I do mean dark. The only light in it came from the dim lights in the front to back halls and if you were in the middle of either of the two spaces away from the halls it was virtually pitch black. It was back here that most of the action seemed to occur whenever I was there.
It was not at all unusual in this back hall to stand leaning up against the wall as others walked slowly past. Many would put their hand out and give you a gentle grope on the way by and if they liked what they felt they may stay and start playing. It was also common that once someone started to play in there others would gather round and join in with the fun.