Let's play dueling press releases. Here's the Department of Health and Human Services:
HHS today announced first-year findings showing that students participating in abstinence education programs have a more positive view toward abstinence than students not participating.
Here's Advocates for Youth:
Evaluation of these 11 [abstinence-only] programs showed few short-term benefits and no lasting, positive impact. A few programs showed mild success at improving attitudes and intentions to abstain. No program was able to demonstrate a positive impact on sexual behavior over time. A description follows of short- and long-term impacts, by indicator.
But at least these kids have a "more positive view" of abstinence.
Update: More here.