amazon position
A female-dominant sex position in which the woman rides her partner while his legs are folded back against his chest, or spread wide with his feet in the air. In either case, her partner's thighs are in front of her rather than behind. Also known as a reverse piledriver. A skilled woman in this position can emulate the pelvic thrusting motion typical of a male partner, giving a near-complete feeling of role reversal.
May be related to femdom or bdsm if the male partner is bound or in amazon position against his will.