By 12th grade, girls are just as likely to be sexually experienced as boys
In the 1990s, senior girls were less likely to be sexually experienced, but the gender gap has closed in recent years. In the ninth grade, girls were less likely to be sexually experienced, but by the 12th grade, they were just as likely.
Percent of sexually experienced high school students
Source: Centers for Disease Control and Prevention, National Youth Risk Behavior Survey, 2011.