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:STEPHEN HAWKING: 'Mankind doomed if we don't leave Earth' - three reasons why‘A world we never imagined’ Study finds Human brain operates in ’11 different dimensions’HEATWAVE WARNING: 74 per cent of population to be exposed to DEADLY temperatures by 2100Trilobites: Summer Solstice: A Great Moment to Ponder the SunBoeing using AI to fly into the future with autonomous planesExplorer: In the Footsteps of Charles Darwin