Glory hole in sex club--anyone else ever seen one like this?

A while back, a buddy of mine took me to a sex club when I was visiting him. This is not typically the type of establishment in which I am comfortable, but my exhibitionist side got the better of me. He was going there to get spanked in front of an audience and I thought it might be interesting. The club was in a derelict building which had been repurposed as a sex venue. There were a variety of areas for different tastes. I went with my friend to the area where the spanking was going on and watched as guys got spanked one at a time in front of an audience of twenty or so in the audience. They seemed to want to be humiliated in front of others as well as experience some pain at the control of others. Each guy would come out on stage with his spanker dressed however he wished and then would bare their buttocks and get spanked with whatever tools he had selected. Some came out dressed and just dropped their pants and underwear but my buddy came out wearing just white briefs. He took his briefs off while the audience watched and let them see his penis before he went over the spankers lap. He then got his ass beaten until it was bright red, after which he stood up and faced the audience to reveal his erect penis. After that, we wandered around a bit and saw a room where a glory hole was being utilized. The crowd in there varied from about five to ten as people wandered in and out. This was different from other glory hole settings I have seen before. The glory hole was in a black wall and was highlighted by a spotlight on the opening. You couldn't see anything except the guy's penis and scrotum and the others waiting to put their junk through the hole were behind the wall so you did not know who was coming next. When a penis came through the hole the crowd would make comments and would take turns playing with it. Mostly people were just jerking them off and playing with the balls until they ejaculated but there was some oral being done. They were squirting within a couple of minutes, then they would withdraw and the next guy would come through. Quite a variety of sizes including some huge ones as some tiny ones. I am guessing the guys with the small ones were showing off for embarrassment. It was a great setting to get a look at a lot of penises. Anyone ever been to a similar type of glory hole?

Not uncommon in gay clubs

The clubs and bathhouses I've been to have usually had the glory hole section arranged like a square room. The walls of the "room" are tall enough that there's a walkway around the outer perimeter, at a height that puts the genitals of the person who wants to be sucked at exactly head-height of the person standing on the other side of the wall and openings at normal floor level on the inside of the enclosure. The place I've been to in Berkeley CA has a room big enough to have six openings in each wall. The outer walls are low enough that a person can look over the top and down at the person who is sucking him off. Some men leave their towels on while they're being sucked, others go naked. You just put your genitals through the hole and something will happen. There are lots of spectators, and sometimes the line is there or men deep in front of each hole in the wall. Its not usual to be groped from behind while you are standing there being sucked. Quite a hot scene, all in all. Lots of groaning and heavy breathing and every now and then a shout or grunt indicating that someone has cum through the hole.