This variation on the edge of the bed sex position shows how the partner being penetrated can raise their legs and rest them on their partners body, either on their shoulders (as shown) or their chest.
You can also see how you can adjust the motion for this position, and where the motion comes from by holding hands or otherwise using each other to move in this position.
The standing partner in this position can also hold on to their partners' hips, allowing for more powerful thrusting and not putting all the strain on their own lower back.
