The Centers for Disease Control and Prevention released their major study of teen girls and sex. The headline of this post contains the main finding.
The news story, and many variants on it, goes on to attack abstinence-based sex ed curricula. This strikes me as a non sequitur, at best. The report does not indicate what sort of sex education these girls might have had. One might look at the raw finding and conclude that we need much more education in abstinence.
The secondary finding is that half of African-American girls have sexually transmitted infections. The rate for white and Hispanic teens is 20%. This is just a disaster. My expectation is that the sexual activity of girls directly correlates with whether their fathers are active in their homes, but that is not provided in the news articles. This would account for the enormous racial disparity in the STI rate, though.