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:Moon landing bombshell: Neil Armstrong admitted 'I don't deserve' fame in rare interviewHawaiian Elders Arrested Trying to Block Telescope ConstructionMoon landing: Buzz Aldrin MYSTERY as astronaut silent on NASA celebrationsAntarctica shock: Bizarre plan to stop ice sheet collapse flooding New York revealedMoon landing hoax: How lie about lunar craft was ‘accidentally’ exposed after decadesOne Small Step for Experimental Space Gear. Many Giant Leaps of Imagination.