My real experience happened some years ago with a then-GF. I can tell you it was SCORCHING HOT when she told me all the details of her dates with other guys. We had been a couple for some time, and she cheated on me while on a 10 day trip away with friends. At first I was angry with her, but after a few days, the thought became sooooo hot!! We talked it out - I asked her if she enjoyed herself (did she do something sexual with the guy) and she did. I asked her if she'd like to continue dating other guys "on the side" while we remained a couple, and she said yes!! I can tell you that while she was out with another guy, I was sticking to the ceiling!! That worry, the angst, the feeling of "abandonment", hurt feelings ................ and the hot, lusty, erotic, sexy, "dream-scenario" was an intoxicating mix of emotions. And to top it off, she enjoyed telling me all the details when she got home. She loved seeing how worked up and rock-hard I got when she told me all they did, it would turn us both on big-time and we'd go crazy on each other then!! (that would usually be the next day).
She'd re-enact what she did to him to make him melt - step by step. She'd describe what she did to him, then do that to me - talking me through it in a soft voice. Killer, killer, KILLER orgasms!!!