a major recent study by the CDC shows that most teens are NOT having sex:
http://www.thesacredpage.com/2011/11/shock-cdc-study-most-teenagers-not.html
http://www.nytimes.com/2011/11/15/health/teenagers-having-sex-are-now-a-minority.html?_r=1
and the debate of whether to let your teens have sex in your home:
http://www.wtsp.com/news/article/218510/250/Teens-having-sex-at-home-Are-you-OK-with-it