Reverse cowgirl is a sexual position where the (typically) male is lying down on his back and the woman straddles his prone body and inserts his penis or other probing device like a strap-on and rides up and down as though she is on a bucking bronco, except facing away from him. She then has full control of the interaction and can speed up, slow down, or even adjust the depth of penetration according to her wishes and the reversed position gives a different angle that may be more pleasurable to the person riding.
At any time the rider may spin around to a standard cowgirl riding position if she so desires. The reverse cowgirl can give some men the ability to penetrate deeper into their partner due to the angle of insertion, although one must be aware of the sensations and the wishes of their partner such that they don't cause accidental injuries.
Iron Noder 2017