Teenage Sex

First, the good news. The National Center for Health Statistics concluded, in a survey released last week, that girls ages 15 to 17 had the lowest birth rate in 40 years. Finally, messages about abstinence and contraception seem to have caught on: 80% of the decline in teen pregnancy is attributed to more birth control. So let's take a minute, parents and teens, to pat ourselves on the back. Done? Good. Now let's get back to work, because here's the rest of the story.

While teen pregnancy is down, there is evidence that kids are still having sex at a young...