The war against abstinence education wages on across the country. The comprehensive sex ed crowd was apoplectic with the results of a Mathematica study that showed kids who had abstinence education programs were just as likely to engage in sexual activity with the same rates of "dangerous" behavior. The flip side of the study showed that abstinence education also "did no harm" in that the "risky" behaviors were just as frequent between both groups, but that got ignored. Predictably, the studies that show abstinence ed works also got ignored.
The study itself has recycled some of the same claims that come up every time someone objects to abstinence education. Representative Waxman did a study in 2004 that purported to show all the damage abstinence education does, but between outright stupid objections and showing that some programs do work, his attempt failed.
The push for comprehensive education is nothing more than an attempt to ram values down parents' throats. The United States is a values pluralistic society that works precisely because other people's values are respected and tolerated. Except in the narrow case of values that are criminal or quasi-criminal, the government shouldn't start dictating to citizens what values they must have, religious or otherwise. In short, if government education programs are going to deal with sex (and it's not clear that this is a necessary area for government to be involved in) they need to do so in a values neutral manner.
A reasonable position would be to allow comprehensive sex ed, abstinence ed, or no sex ed at all to be choices available at the sole discretion of the parents. Parents, as a rule, know their children the best and are best able to make the most informed decisions about them. However, far too often the government turns the school system into a parole office for which parents must issue an accounting of their decisions after committing the crime of conception.