A recent study by the Pew Research Center titled "Living Together: The Economics of Cohabitation," finds that rates of cohabitation in the U.S. have gone up significantly over the last 15 years. Authors Richard Fry and D’Very Cohn use census data from heterosexual couples who (unlike many of their homosexual counterparts) have a choice between getting married, or simply living together unmarried. Fry and Cohn write:
Cohabitation is an increasingly prevalent lifestyle in the United States. The share of 30- to 44-year-olds living as unmarried couples has more than doubled since the mid-1990s. Adults with lower levels of education—without college degrees—are twice as likely to cohabit as those with college degrees.
Perhaps you already guessed that - the pressure to get married isn’t quite the same as it was 50 years ago. What’s more interesting though is that the level of education makes a big difference as to how the median household income of cohabiters measures up against their married counterparts.