Abstinence-only programs fail to curb teen sex:

Programs that focus exclusively on abstinence have not been shown to affect teenager sexual behavior, although they are eligible for tens of millions 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.

The report, which was based on a review of research into teenager sexual behavior, was being released Wednesday by the nonpartisan National Campaign to Prevent Teen and Unplanned Pregnancy.

The study found that while abstinence-only efforts appear to have little positive impact, more comprehensive sex education programs were having "positive outcomes" including teenagers "delaying the initiation of sex, reducing the frequency of sex, reducing the number of sexual partners and increasing condom or contraceptive use."

"Two-thirds of the 48 comprehensive programs that supported both abstinence and the use of condoms and contraceptives for sexually active teens had positive behavior effect," said the report.

This is hardly a surprise.  Giving kids the facts enables them to make wise decisions.  Hiding the facts and giving them moral lectures has the opposite effect.