One time. We have been married 16 years now. We were both married and very unhappy with our partners at the time. It was not a good thing to do, but we were talking one night and both of us were going to file for divorce--this was when we were just friends--and once we realized the implication.....
I haven't but I said other because as long as all involved parties are aware of the situation and ok with it I don't see much of a problem, like open or poly relationships. But that's probably not what you're talking about maybe?
Would you/have you ever date/dated someone in a relationship already?
DId when I was younger and it was a train wreck. He kept telling me they were broken/breaking up, and it never happened. I felt so terrible for her since he was lying to both of us. She had no idea about me. I still have a lot of guilt over it. She didn't deserve that!