Lack of penis is a very serious disease. It is cause when masturbating, but do not ejaculate. It is similar to Blue Balls except LOP is the swelling of the penis. This may seem like a good idea, but keep in mind that if it swells too much, it will lose its nerves, slowly disconnecting itself to your crotchal area. In 5-7 weeks, it will fall off.
Son, if you don't stop masturbating, you'll get LOPs and your willy will fall off!