Linking women's worth to their sexuality is not a new phenomenon, says author Jessica Valenti in "The Purity Myth," but today's women are bombarded with conflicting messages from society. Our culture blatantly promotes sex, but at the same time punishes women who choose to be sexual. What do you think? Does prizing virginity and chastity in our culture hold women back? Or is it right for women to be defined by what they do with their bodies?