Here's the PDF report on the effectiveness of abstinence-only programs (hint: they're not).

Furthermore,

Abstinence-only sex education programs, a major plank in President Bush's education plan, have had no impact on teenagers' behavior in his home state of Texas, according to a new study.

Despite taking courses emphasizing abstinence-only themes, teenagers in 29 high schools became increasingly sexually active, mirroring the overall state trends, according to the study conducted by researchers at Texas A&M University.

The study showed about 23 percent of ninth-grade girls, typically 13 to 14 years old, had sex before receiving abstinence education. After taking the course, 29 percent of the girls in the same group said they had had sex.

Boys in the tenth grade, about 14 to 15 years old, showed a more marked increase, from 24 percent to 39 percent, after receiving abstinence education.

Link to blog post, original no longer is public domain.