In 1957, University of Michigan psychology professors Joseph Veroff, Elizabeth Douvan, and Richard Kulka released a survey that examined American attitudes to being single. The findings were stark: 80% of those surveyed believed that people who preferred being unmarried were "sick," "immoral," or "neurotic." At a time when more than 70% of adults were married, it's not surprising that people would express a preference for wedded life. But the scorn certainly sounds jarring to contemporary ears. Oh, how things have changed. Americans are now within mere percentage points of being a majority single nation: Only 51% of adults today are married, according to census data. And 28% of all households now consist of just one person -- the highest level in U.S. history.