My wife met one of my female co-workers (23 years younger than us) at one of our work Christmas parties and she instantly picked her as our "unicorn" even though I didn't say a word. Quick back story- I told my wife a few years ago that I really wanted to experience a threesome before age takes us out of the game. After many discussions about the subject (during sex), in the case it did happen, we wanted to establish rules, etc.. Back to the story. In the days and weeks to follow the Christmas Party, my wife actually guided me on how to effectively "hit on" my co-worker and go as far as taking her to lunch a few times and even make out with her. When I finally told her that my wife and I both were attracted to her and wanted her badly, she was shocked but pleasantly surprised. It turned out that she was bi-sexual and that she was SUPER turned on by my wife (who is very hot). We eventually setup and had that night of BLISS! On top of that, we still work together and have become good friends (with benefits). This is a true story......all of it, even the good parts I left out. If you want to know why my wife agreed to all of this, her reasoning was that if I was going to cheat, I'd cheat. She decided that being open and honest with each other is the best policy and we literally have the best marriage now. I offered the same experience with a second male for her, but she wasn't interested. Oh well, I tried. To answer the question, the hottest thing a woman has ever done to me, is help me bring another woman into our bedroom.