Cinderella marries Prince Charming. Aladdin weds Princess Jasmine. In 50 Shades of Grey, Ana falls for Christian. From bedtime stories to films, we are exposed to a repeated idea: that love, or at least lust, crosses class lines. In fiction, cross-class relationships either end in marriage and happily-ever-after, or else in dissolution and even death. But what happens in real life?