New study finds some boys are having sex before age 13

In two national surveys, investigators found that between 4% and 8% of boys reported having sex before they were 13. That number varied greatly depending on where the boys lived. In San Francisco, just 5% of boys said they had sex before 13, but in Memphis that number jumped to 25%.

Race and ethnicity also made a difference in whether or not a young person had an early sexual experience. Black males were most likely to have sex before 13, followed by Hispanic males.