I would imagine sex in space would be quite difficult. The whips and chains would just hang in mid air, and the midget dressed as a clown would be stuck on the ceiling!
Well there was an early SF story about the discovery of a new race, the Splend, with at least 7 different genders, at least five of whom must be present to complete the mating process.
Scientists summarized that Splend is a many lovered thing.