You might think otherwise but Men's Health says you're not close enough. They've listed 15 things you don't know about your penis.

14. No brain is necessary for ejaculation. That order comes from the spinal cord. Finding a living vessel for said ejaculation, however, takes hours of careful thought and, often, considerable amounts of alcohol.

15. The most common cause of penile rupture: vigorous masturbation. Some risks are just worth taking.