Now I Lay My Hand Down to Sleep

Starting on your hands and knees, lay your right forearm (if you're right-handed) down on floor and rest your head on it, and get an erection by using your left hand. If you do it right, by the time you become erect your right hand will fall asleep and lose its feeling. When you begin stroking yourself with your right hand, it'll feel almost like someone else is doing it for you. For safety reasons, don't do this for too long, and whatever you do don't use any artificial methods of cutting off the circulation to your hand.