Grandma warned about "living in sin." Ladies in her day had to be delicate about such matters, but with a voice full of foreboding she'd offer these words to the wise: "He's never going to buy the cow if he can get the milk for free." The cow, of course, was the one-carat rock, the white picket fence, the happily ever after.
Grandma now has support from an unlikely quarter--academe. According to a controversial report released by the National Marriage Project, a group committed to "revitalizing marriage," based at Rutgers University in New Jersey, cohabiting couples are more likely to experience...