I've always been able to do this... fun!! Freaks the person out when they don't know you can do it too :) hahah I love when the guy/girl is sitting on top of you before *you get the ride* :) and making it slap their ass without using your hands at all ... EVERYTIME it makes them want it more!

Also, do it when they need a rest time... inside them. Their eyes get sooo huge! hahaha