OK I will jump in- NO JUDGING.....
There is a swingers club here in my city and I was invited to one of their parties this summer by a lady at my gym. She just came up, commented on how good I looked , told me she was married, and invited me. I said ok sure with some hesitation. I had to call the director and interview with him. He told me rules- like when a woman means no its no and if we violated that were were permanently banned. The party started as a social thing- you brought good as did everyone else, and met everyone. I was surprised to meet a powerlifting chick and her husband who competed early in his life. The chick has hard as steel glutes. It was kind of awkward at first because I really did not know anyone except the lady at my gym but everyone was nice(read: this was not their first time at the rodeo). Everyone got in the pool and eventually everyone had to take off their bathing suits. The think here is you have all types of people at these parties- younger, older, african american, anglo, latino, etc. It's all about the sex and voyeurism no love is involved. Everyone is definitely comfortable and these couples at the party had been together for a very long time. We then went into this huge room with this round bed and got going. I can tell you that having multiple women on you is pretty damn hot and going down on two at a time is hot too while you are getting blown.
Liked seeing the chick-chick thing too- that was really hot.
Sex was always with a condom and some guy had his wife on a massage table- she was hot and guys took turn eating her and fucking her. Lots of people watching all the time , lots of people coming in and out of the room.
As I was getting dressed to leave a fine wife came up and told me bye- she kissed great, and I ended up fingering her and sucking on her nipples.
Anyway, its probably too much information but that was away past my comfort zone but I had a good time(I was sore for days- I hadn't had that much sex since I was in my 20's.....