WASHINGTON (AFP) - It has all the ingredients of a wedding. The proud tuxedo-clad father, the frosted white cake, the limousines and an exchange of vows. But there is no groom and the girl in the long gown is no bride. She's daddy's little girl, there to take a vow of chastity. In what is becoming a trend among conservative Christians in the United States, girls as young as nine are pledging to their fathers to remain virgins until they wed, in elaborate ceremonies dubbed "Purity Balls." The gala affairs are intended to celebrate the father-daughter relationship. The highlight is...