A report from the Federal Interagency Forum on Child and Family Statistics found that 47% of high school students say they've had sexual intercourse-down from 54% in 1991. The most current statistic has remained fairly stable since 2001 when 46% of students said they had had sex.  

"The lower figure on teens having sex means the risk of sexually transmitted diseases is lower," Edward Sondik, director of the National Center for Health Statistics, told the Associated Press (7/13/2007).

Of those having sex during a 3-month period in 2005, 18% reported using birth control pills before their last sexual intercourse. About two thirds, or 63%, used a condom-that's an increase of 17 percentage points since 1991. 