A type of harness specifically for the purpose of sexual intercourse in which one partner is suspended, either above a bed or in a clear area, while the other moves freely. Though there is considerable variety, most common sex swings have a sling for the back, another for the butt & stirrups for each leg, which can be adjusted. Some models are suspended from a bunjie or spring to provide bounce.
1) kid: Sweet! your step-mom has a swing in her bedroom!
friend: ya but she won't ever let me use it. Let's go watch SpongeBob.
2) Sex in the City Guy: Do you swing?
Girl: you mean with other couples?
Guy: No, I mean SWING...
3) Honey let's use the sex swing tonight, I want to try a new position.