It surprises my GF and I as to how many guys on here are anti-swinging. We started about seven years ago and have enjoyed every time we play with others. The first time we went to a swing club we agreed that it would just be soft swap, no penetration. We had a great time and it was a real turn-on to see other guys play with her, suck her nipples and her clit, and to see her suck their cocks. The second time we went to the club we had the same agreement. But, we hooked up with a couple and while I was going down on the gal and giving her multiple orgasms, my GF was really getting involved with the other guy, sucking him until he came and having him suck her clit until she came. The other gal and I came up for air about the same time the other guy got back from the bathroom where he had changed his condom. We watched as he went down on my GF again for a while, and then moved up on his knees between her legs, with his hard condom covered cock in his hand. He started to rub it on her pussy lips and her clit. She looked over at me and raised her eyebrows as if to ask me if it was alright if she fucked him. A thousand thoughts went through my head in a second, but I loved her and wanted to see her enjoy herself. So, I nodded, "Yes," she reached down and grabbed his shoulders and pulled him up and into her. We watched while she fucked him for about 12 strokes, and he came. He apologized, saying, "You are so tight, I could not stop myself." She laughed and told him, "Don't worry, you will last longer the next time." And, he did.
We both enjoy watching, and hearing, the other have sex with our friends.