When I was in college in NYC from 1980 to 1984, I belonged to a group of gay, bi and "curious" guys who formed a fantasy group. All the members had to be cool with any new members who came into it. You'd post your fantasy on the group's bulletin board (it was four of the guys quad room) and whoever wanted to fulfill your fantasy with you would take it off the board (there would be several copies of the same post if it required more than one guy) and you and the guy with the fantasy would arrange a time to play it out. One of the hottest was a guy who had a rape fantasy that we did in Central Park - in the Rambles - late at night. He was in those "onion skins" running shorts they had back then, and a tank, and me and another guy played muggers who wrestled him to the ground, pulled him into the bushes and fucked him from both ends, knocking him around some and dumping a couple of loads... he LOVED it. I would not wanted to have taken it too much further, as he did sport some bruises and cuts from it, but he was happy. In case you are wondering, we all carried copies of a note we all signed stating we were all friends and were doing this for fun - just in case a cop showed, we might have been picked up for public lewdness or something, but at least it wouldn't be construed as an actual attack! Boy, were we stupid, but boy was it fun!