It is called "Rodeo"
Anybody curious?
It will only work with a SO or girl friend.
Lay her flat on her stomach, like if you would start a surfboard. Place your legs across her legs, to make sure she can't move them.
Penetrate her but no movement yet.
Grab her wrists so she can't move her arms.
Place the weight of your upper torso over her upper torso keeping your head on the side of her head.
Start the movements, then say to her ear: "your sisters pussy is tighter than yours"
Stay on top at least 8 seconds!