No duh: Teen boys masturbate a lot.

A nationwide study of 800 teenagers ages 14 to 17 who responded to the National Survey of Sexual Health and Behavior in 2009 made the groundbreaking discovery that teen boys like to jerk off, teen boys jerk off more than teen girls masturbate, and teen boys start jerking off earlier than teen girls do. Shocking, shocking and more shocking, right? Obviously this research about teen girls and masturbation did not include the Frisky staff, which would have thrown the results! [U.S. News & World Reports]