Have you ever been to a swingers club?

Yes; I was dating someone several years ago who had a certain lust for life, and she expressed to me that this was something that she wanted to experiment with. She found a group online, and we went (for what it's worth couples are generally welcome however single men are almost never welcome). We talked to a few couples, and watched several groups of people have intercourse (MMMF, MMF, MFF, MMMMF, MF). We ended up having a swap with another couple. The people that were there weren't overly attractive on any level, but most were, if nothing else, polite.