Take a Number: Nearly Half of Teens Have Had Sex by Age 19, Survey Finds Sexual activity declined among adolescents in the 1990s, and rates have remained low. Still, teenagers in the United States are more likely to become pregnant than those in other western countries. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Could a Tiger Tragedy Have Been Avoided?NASA warn 'APOCALYPSE asteroid' Bennu WILL appear in the sky this Valentine's DaySpaceX launch: Where is Starman now ONE year AFTER liftoff - when is next launch?NASA asteroid WARNING: Asteroid found LAST WEEK will skim Earth as close as the Moon TODAYNASA scientists detect ROGUE planet that caused ‘DEVASTATING assault on solar system’SpaceX launch: Starman trackers warn Elon Musk's Tesla Roadster will CRASH into Earth