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There's strong evidence that there is protection in abstinence based sex ed;

The slides showing efficacy of the abstinence only approach, from the presentation in Toronto are here.

And here's a review of the discussion:

A study of 662 African-American Grade 6 and 7 students from inner-city middle schools in Philadelphia found those taught an abstinence-only approach to sex were less likely to have had sexual intercourse at 24 months' follow-up compared to those put through a "safer sex" intervention that emphasized condom use but made no mention of abstinence.
And while Bill Clinton, the former U.S. president, told delegates to the International AIDS Conference in Toronto yesterday that abstinence programs delay sexual activity but make teens less likely to use condoms when they do start having sex, the study found the opposite to be true.
"It did not reduce intentions to use condoms, it did not reduce beliefs about the efficacy of condoms, it did not decrease consistent condom use and it did not decrease condom use at last sexual [encounter]," lead author John Jemmott, of the University of Pennsylvania, said.
The youngsters in the study ranged in age from 10 to 15; half were girls. Twenty-three per cent said they had had sexual intercourse at least once before the study began.
"There aren't any studies that show that children are less likely to use condoms as a result of an abstinence intervention. I've looked in the literature, there are no studies that show that," Mr. Jemmott said in an interview.

Heres a FReeper post from August.