Stubborn things, those hormones

Reason Magazine - Despite Government Spending, Teens Still Having Sex:

Programs that focus exclusively on abstinence have not been shown to affect teenager sexual behavior, although they are eligible for tens of mil lions of dollars in federal grants, according to a study released by a nonpartisan group that seeks to reduce teen pregnancies. "At present there does not exist any strong evidence that any abstinence program delays the initiation of sex, hastens the return to abstinence or reduces the number of sexual partners" among teenagers, the study concluded