How to do it:
Have your man sit up on the bed so that his legs are extended horizontally toward the foot of the bed. Turn around and straddle him - with your back toward him - and then lower yourself onto his erect penis. Extend your legs back so they are almost behind him, relaxing your torso onto the bed between his feet. Slide up and down and use his feet for leverage.
Why it's hot:
This position allows for great control over speed, depth, and intensity of stimulation. Since you're facing away, you can feel totally uninhibited, and your partner can enjoy the thrill of the ride.