One is a soft-spoken teenager who never sought fame, but was thrust into the national spotlight at the most delicate moment of her young life. The other is a glamorous pop star, a fixture in celebrity magazines and on countless iPods. Bristol Palin and Rihanna ...

Groundbreaking research suggests that pregnancy rates are much higher among teens who watch a lot of TV with sexual dialogue and behavior than among those who have tamer viewing tastes. "Sex and the City," anyone? That was one of the shows used in the research ...