How to do it:
Begin by lying on your back at the foot end of the bed. Have him mount you missionary style and when you're both close to climax, inch toward the edge of the bed until your head, shoulders, and arms hang backward over the side. Then tell him to keep on thrusting.
Why this sex move rocks:
The blood will rush to your head, so you can experience erotic inversion, and send tingles to your upper body that will turn your climax into an otherworldly experience. Just don't maintain this position if you feel too lightheaded. Passing out from pleasure sounds like a good idea, but it's not meant to be literal.