This position is where the woman turns around, with or without removing herself from her lover’s penis, so that she is facing his feet.
Reverse, Cowgirl Style
She then can thrust her hips in vertical or circular motions in this position, which allows for deeper penetration.
Also, should she desire to vary the angle of penetration, she merely has to lean back or lean forward, clutching his legs if necessary or placing her hands on the bed for support.