Piledriver (sex position)

The piledriver is a sexual position.^[1][2][3] Named after the downward motion of an actual pile driver, the position is executed by the receiving partner lying supine bent into a front bend in a pose similar to the yoga plow pose, bottom up, with legs bent over head, while the inserting partner stands above and inserts a penis or other object downwards into the receptive partner's vagina or anus.

A couple engaged in the piledriver position:
Left: Forward position (facing each other), Center: Reverse position (female perspective), Right: Reverse position (male perspective)

Though the position is quite strenuous for both participants, it is particularly so for the receptive partner, who is severely constrained by the front bend.