From Dan Quayle's attack on TV's Murphy Brown for giving birth out of wedlock, to the referendum recently passed in Colorado that forbid local communities from enacting non-discrimination laws for sexual orientation, the public furor over issues of same-sex marriages, gay rights, pornography, and single-parent families has erupted with a passion not seen since the 1960s. It is a battle being fought, in large part, over where to draw the line between...