Jewels Morris-Davis is a no-nonsense kind of girl. When the high school sophomore turned 16 recently, she didn't celebrate with any My Super Sweet 16 foolishness. Nor did she rush to get her driver's license and race around the back roads in this rural northwest corner of South Carolina. But Jewels did quietly revel in one achievement. "I am," she says a few weeks later, a proud smile spreading across her face, "the first person in my family to reach 16 without getting pregnant--or getting somebody pregnant."
Five years ago, Jewels was firmly on track to continue the family tradition of...