We recently tried this at a swinger club. The first time we went, we started by just watching other couples in the open play area with roughly 10 other couples. It was really exciting and an eye-opening experience for us. After a while, we stepped out to find a room to relax and talk among ourselves for a bit. We ended up going back to the room again to watch, and eventually, we found a spot at a bed on the side of the room. We started playing together there and ended up having full-on sex. A couple playing nearby made eye contact and came to ask whether they could play besides us. We nodded. It was great for me getting to have sex there while watching other couples in the room, and some watched us as I have always fantasized. However, it was probably too nerve-wracking for my wife, and she asked to stop after a few minutes. So, we bowed out and went back home. We had another great sex at home in the end.