When I jack of, I've found that if I rub the space below my balls and anus gets just as hard as my cock and that when I rub it, pressing on it hard, it feels incredible. When I cum, I can feel the juice pulsing through this space as well and if I press hard on it, I can control my ejaculation. I discovered this in the bathroom, standing above the sink. When I started to cum, I sank down on the edge of the sink and could feel my cum coming out. It was great. I'm certain this is well-known among others and that it has a medical definition...can anyone help me understand it? Thanks!