Great Sex Positions: leaning tower of Pisa
This position is ideal for prolonged sex sessions, so lube up well beforehand...
With your man lying on his back, his knees bent and his feet firmly on the mattress, straddle your man so that you're facing him.
Slide down onto his lubed-up penis, then lean back against his knees for support. You can either place your hands on his hips for leverage when thrusting up and down, or on the bed if it's within easy reach.
You have great control over both the angle and depth of penetration here, while your clitoris is at maximum exposure, meaning your lover can stimulate you while you glide up and down his cock.