Tables have so many interesting functions and we really don't use them as frequently in our stories as we ought to. The idea of a tilted table is good. When the head is lowered it is called Reverse Trendellenberg position. It "makes the blood flow to the head" (actually it promotes venous return from the legs increasing central venous pressure) and is thereby used to counteract shock. Restraining a bottom on a table in the supine position with their buttocks hanging over one end is one of the classic poses of bondage. The problem always is, what do you do with their feet and legs! The frequently illustrated solution, ankles secured up near the head is feasible only for the long and slender rather than the mature. Putting a very firm pillow or cushion under the small of the back helps make the bottom more comfortable. But the problem still remains as to how to secure the feet up in the air without construction of elaborate equipment.