Knee fuck is a rare sex position between males and mostly females. For knee fuck both partners lie flat on their backs beside each other. She bends her knee which is at his side in a way that it forms a crease and squeezes the shaft of his penis between her lower thigh and upper calf. Due to the applied pressure his penis will start to further erect, especially the head of his penis. He now starts moving his penis in and out of the tunnel formed by her knee. Lubrication is recommended for a successful knee fuck. Pantyhose fetishists prefer her legs dressed in pantyhose or stockings during knee fuck rather than legs being nude. If he does not move his penis but she starts moving her knee up and down on his penis, it is not called knee fuck but considered delivering a knee job.