From the New York Times, excerpts from:
In a nationwide survey conducted in 2001 by the National Marriage Project, then at Rutgers and now at the University of Virginia, nearly half of 20-somethings agreed with the statement, “You would only marry someone if he or she agreed to live together with you first, so that you could find out whether you really get along.” About two-thirds said they believed that monationwide surveyving in together before marriage was a good way to avoid divorce.
But that belief is contradicted by experience. Couples who cohabit before marriage (and especially before an engagement or an otherwise clear commitment) tend to be less satisfied with their marriages — and more likely to divorce — than couples who do not. These negative outcomes are called the cohabitation effect.
Researchers originally attributed the cohabitation effect to selection, or the idea that cohabitors were less conventional about marriage and thus more open to divorce. As cohabitation has become a norm, however, studies have shown that the effect is not entirely explained by individual characteristics like religion, education or politics. Research suggests that at least some of the risks may lie in cohabitation itself.
WHEN researchers ask cohabitors these questions, partners often have different, unspoken — even unconscious — agendas. Women are more likely to view cohabitation as a step toward marriage, while men are more likely to see it as a way to test a relationship or postpone commitment, and this gender asymmetry is associated with negative interactions and lower levels of commitment even after the relationship progresses to marriage. One thing men and women do agree on, however, is that their standards for a live-in partner are lower than they are for a spouse.
Sliding into cohabitation wouldn’t be a problem if sliding out were as easy. But it isn’t. Too often, young adults enter into what they imagine will be low-cost, low-risk living situations only to find themselves unable to get out months, even years, later.
…I’ve had other clients who also wish they hadn’t sunk years of their 20s into relationships that would have lasted only months had they not been living together. Others want to feel committed to their partners, yet they are confused about whether they have consciously chosen their mates.
Founding relationships on convenience or ambiguity can interfere with the process of claiming the people we love. A life built on top of “maybe you’ll do” simply may not feel as dedicated as a life built on top of the “we do” of commitment or marriage.