What is the wildest thing you have ever done sexually?

[Rebel39Y]

 When I have chatted with people over the years I always to like to hear what they consider the wildest thing they have ever done sexually. I know that some may be tempted to lie or make something up, but for the most part I think I have gotten real answers.
 Since I have been a occasional swinger, my wildest experiences have changed and expanded over the years, LOL. However the one that really sticks with me was my first threesome. I had been over in the Desert during Desert Storm and got a letter from my best friend stating that he was getting married, and expecting a baby.  When I rotated home I went on leave and went to visit him. His wife was probably 7 months pregnant and gorgeous. We were watching a movie one night all sitting on the couch. He started tickling her and putting ice on her neck. She was squealing and wrestling with him, while her long nightgown was pulling tight in all the right places. I was laughing and enjoying the show as he started to rub ice down her neck and chect getting bolder as he went. He grabbed her arms and pinned them to the back of the couch and told me to make myself useful and hold her hand.
 As I held her hand  she squeezed my hand and looked over at me and I about melted. He had the top of the nightgown open and was sucking a nipple. That was the start of an unforgettable night. If anyone is interested in the rest of the night just let me know and I might write some more.
 So what is the wildest thing you have ever done sexually?