Fire Hydrant

You in a tripod headstand with your legs bent and spread eagle while he does you from the upside-down, front.

Why It's Impossible: For starters, most of the world can't do a tripod headstand without hurting themselves. If you can, good for you, but can you hold it long enough to achieve orgasm? Can you hold it with your legs spread like that? Can he hold you up while he thrusts without giving you a spinal cord injury? These are a few of the questions that must be addressed before you try this one.