Not drinking or driving, teens increasingly put off traditional markers of adulthood -- The Washington Post

Teens have also reported a steady decline in sexual activity in recent decades. The portion of high school students who’d had sex fell from 54 percent in 1991 to 41 percent in 2015, according to statistics from the Centers for Disease Control and Prevention...
https://www.washingtonpost.com/local/social-issues/neither-drinking-nor-driving-more-teens-are-putting-off-traditional-markers-of-adulthood/2017/09/18/b46027a0-93f1-11e7-8754-d478688d23b4_story.html