1 definition by Alliestalker
A mandatory sex party is like a normal sex party, except if you don't attend you get arrested. People are told they will be attending a costume party, but what really happens is a wild, out-of-control orgy involving beer, fire, and moving logs onto the road.
Allie: So, how was your costume party last night?
Roger: It turned out to be a mandatory sex party.
Duncan: Those actually exist???
Roger: It turned out to be a mandatory sex party.
Duncan: Those actually exist???
by Alliestalker October 15, 2009