That serial killer I was considering dating went to a sex party/club with his second wife, had her hand-cuffed to the ceiling, ball-gagged, and non-consensually sexed by guys. He told the dudes she was into it and the resistance was part of the fantasy. Like 2-3 guys were with her before someone realized something was wrong. This was the early 80s, too, so I imagine these parties were way wilder then.