As a high school teen, I experienced several threesome experiences with two women and never found them to be particularly satisfying even though I had fantasized about "being ravished" by multiple females from puberty on.
My life changed when, in my thirties, I came home from work early and caught my wife in bed with another guy. I was shocked and angered. I went and got my shotgun from a closet and burst into the bedroom where they were rather actively engaged. I had two problems however.
Intellectually, I knew I did not want to spend my life in jail; nor did I want to lose my wife. Emotionally, while I felt betrayed, I was also terribly aroused.
I put the gun down and told my wife I needed to talk. I explained my very complex, confused emotions, and told her it was the betrayal that hurt, not the sex. I then completely surprised her when I asked her what she thought about two men at once. While hesitant, she agreed. Her lover too was hesitant and a bit wilted having focused like a laser on my shotgun. I don't know if he was aroused by the idea or scared of what might happen if he said no. Ultimately, he agreed. The experience was awkward, fun, arousing, silly, and many other things. Great sex it was not -- but it definitely held promise. We agreed it was interesting and fun but were not certain we wanted to continue. The other guy was not particularly enthused by the whole scene and soon made himself scarce.
We went about our lives, struggling through a marriage in which we had married too young, for all the wrong reasons, and into which we brought children far too soon. But as much strife as we had, we truly loved each other.
It was several years before we had our second experience. Now in our mid thirties, we had moved due to financial necessity. Our neighbor was a single father of two boys, about ten years our senior, and as we became closer and closer, I began to see changes in my wife's behavior -- things I had noticed once before -- just before I had caught her in bed. I won't bore you with details, but I became convinced she either wanted or was having an affair with our neighbor. I began to plot and scheme about how I was going to catch them. I would not be a cuckold.