As long as there have been teenage sex and teenage pregnancy, there has also been a familiar pattern for young people dealing with this unwelcome event: first denial, then a creeping fear and perhaps a few fretful, secretive exchanges before the news finally comes out. In the case of "Mary Smith,'' a 15-year-old freshman at Blair High School, and her 16-year-old boyfriend Heath Mayfield, a junior varsity running back with a spanking-new Ford Mustang, the pregnancy was well into the fifth month before they finally confirmed it with a home-test kit.
That was Sept. 26, 1994. Two days later, Mary (whose...