inverted helicopter

The sexual act of a gentleman arching his back with dong pointed upwards, whilst his partner mounts said gentleman, fully lubricated, and spins atop his throbbing member.

Chastity: "I have to go see the doctor tomorrow."
Kristin: "Really? Why, do you have a cold?"
Chastity: "No, Randy gave me an inverted helicopter last night, and I think he tore my butt apart."