prone bone
A sex position where the receiving partner lies flat on their stomach (generally, only the stomach, crotch and maybe thighs need to be completely down flat on the surface) while being penetrated from behind.
另请参见
接收伴侣平放在他们的胃上的性别位置（通常，只有胃，cort，也许只有大腿在表面上完全平坦）。