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:Trilobites: The Mucus-Shooting Worm-Snail That Turned Up in the Florida KeysTrilobites: Ancient Cannibals Didn’t Eat Just for the Calories, Study SuggestsMaking life FROM SCRATCH? Scientists on brink of technological breakthroughSouth African Court Ends Ban on Sale of Rhinoceros HornsCould Earth-sized planet 39 light years away with hazy atmosphere be a 'WATER WORLD'?What is NASA’s New Horizons mission? Spacecraft halfway from Pluto to next target MU69