In the late 80's my wife and I lived in a hard-partying apartment complex near Tampa. Every illegal substance known to man was available and we partook liberally in the partying and the swinging situation we found ourselves in. We were open to playing around as we had done it a half-dozen or so times during and right after graduation from college.
Mostly we partied with two other couples in school and continued to have threesomes and foursomes for several years after school. My wife and I gave each other permission to play with our school friends even if we weren't there. That was a very liberating experience for both of us. I think we were so confident of our own sexual relationship with each other and our friends that we did not worry about possible complications. Everyone seemed cool with it.
Several years later, my wife and I brought a single gentleman into our bed. We were friends from a sports team we all played on. Many weekend evenings were spent in bed with my wife pleasing us both and us doing our best to make sure she had a great night. We knew if my wife had a very sexually satisfying time, she would continue to fuck us both.
At this point, my wife had only ever had me cum in her mouth. The first evening we were playing with this gentleman, I was fucking her from behind while she sucked his cock. She was an excellent cocksucker and in no time, he filled her mouth. It was so sexy to hear my wife gulping our friend's load. Once he had stopped cumming my wife pulled his cock from her mouth and looked at me. She had white cum around the edges of her mouth and simply said, "Wow!" and laughed.
Another couple that belonged to the team also was our dealer. Brad was married to the sexiest woman on the team, Lynn. Lynn was one of those tasty 80's women with huge breasts, bleached blonde hair and an ass to die for. We always flirted with each other's spouse but certainly to my disappointment, nothing ever happened.