Unicycle Sex Position is a like an inverted pile driver position. In this position the guy will be the one at the bottom bringing his lower body upward. She will then sit or lower herself into his erected penis making up and down motion. Watch out because this will bend your dick on the wrong way! She should support all her weight by her legs while on this position.
This position has some degree of difficulty. This position can be very uncomfortable for him to keep this position long enough if his body is not trained. On her part making pumping up and down is also strenuous because it’s a squat like position.