In hatha yoga, this is a resting position and is often the final pose of a yoga set. In Sanskrit it means "corpse pose." In many versions of the goddess ,a href="http://www.llewellyn.com/encyclopedia/term/kali">Kali, she is shown standing or copulating on the corpse of Shiva (or course, Shiva is a god and isn't actually dead, just in trance). In some Tantric traditions, savasana is the name of a sexual position, or asana, that mimics the union of Shiva and Kali. The male lies on his back, still and like a corpse. His partner unites with him from above. Usually, both partners will focus on mentally moving the sexual energy (kundalini), so there may be very little physical motion during this act of sacred sexuality.