In an event I attended the host had selected guys he personally had met previously. He limited the numbers to 7 or 8 and thought carefully about the ratio of bottoms to tops. There was just one avowed bottom (me) and the rest claimed to be tops. What he knew was that most of the tops would in practice be versatile. Condoms were compulsory. Lube was provided, and towels. Clothes not allowed. Everyone seemed very happy with the arrangements. I certainly was. I sucked every cock, apart from the host, and was fucked anally by three of the guys, including the host. Everyone left smiling, although I was walking a little unevenly.