Unmarried cohabitation has become a prominent feature of modern life and is undoubtedly here to stay in some form. The demographic, economic, and cultural forces of modern life would appear to be too strong to permit any society merely to turn back the clock, even if it so desired. Yet by all of the empirical evidence at our disposal, not to mention the wisdom of the ages, the institution of marriage remains a cornerstone of a successful society. And the practice of cohabitation, far from being a friend of marriage, looks more and more like its enemy. As a goal of social change, therefore, perhaps the best that we can hope for is to contain cohabitation in ways that minimize its damage to marriage.  With that goal in mind, are there any principles that we might give to young adults to guide their thinking about living together before marriage? In developing such principles it is important to note that, because men and women differ somewhat in their sexual and mate-selection strategies, cohabitation often has a different meaning for each sex. Women tend to see it as a step toward eventual marriage, while men regard it more as a sexual opportunity without the ties of long-term commitment. A woman’s willingness to cohabit runs the risk of sending men precisely the wrong signal. What our grandmothers supposedly knew might well be true: If a woman truly wants a man to marry her, wisdom dictates a measure of playing hard to get.47

Pulling together what we know from recent social science research about cohabitation and its effects, here are four principles concerning living together before marriage that seem most likely to promote, or at least not curtail, long-term committed relationships among childrearing couples:

  1. Consider not living together at all before marriage. Cohabitation appears not to be helpful and may be harmful as a try-out for marriage. There is no evidence that if you decide to cohabit before marriage you will have a stronger marriage than those who don’t live together, and some evidence to suggest that if you live together before marriage, you are more likely to break up after marriage. Cohabitation is probably least harmful (though not necessarily helpful) when it is prenuptial – when both partners are definitely planning to marry, have formally announced their engagement and have picked a wedding date.
  2. Do not make a habit of cohabiting. Be aware of the dangers of multiple living together experiences, both for your own sense of well-being and for your chances of establishing a strong lifelong partnership. Contrary to popular wisdom, you do not learn to have better relationships from multiple failed cohabiting relationships. In fact, multiple cohabiting is a strong predictor of failure of future relationships.
  3. Limit cohabitation to the shortest possible period of time. The longer you live together with a partner, the more likely it is that the low-commitment ethic of cohabitation will take hold, the opposite of what is required for a successful marriage.
  4. Do not cohabit if children are involved. Children need and should have parents who are committed to staying together over the long term. Cohabiting parents break up at a much higher rate than married parents and the effects of breakup can be devastating and often long lasting. Moreover, children living in cohabiting unions are at higher risk of sexual abuse and physical violence, including lethal violence, than are children living with married parents.


Despite its widespread acceptance by the young, the remarkable growth of unmarried cohabitation in recent years does not appear to be in children’s or the society’s best interest. The evidence suggests that it has weakened marriage and the intact, two-parent family and thereby damaged our social well-being, especially that of women and children. We can not go back in history, but it seems time to establish some guidelines for the practice of cohabitation and to seriously question the further institutionalization of this new family form.

In place of institutionalizing cohabitation, in our opinion, we should be trying to revitalize marriage-not along classic male-dominant lines but along modern egalitarian lines. Particularly helpful in this regard would be educating young people about marriage from the early school years onward, getting them to make the wisest choices in their lifetime mates, and stressing the importance of long-term commitment to marriages. Such an educational venture could build on the fact that a huge majority of our nation’s young people still express the strong desire to be in a long-term monogamous marriage.

These ideas are offered to the American public and especially to society’s leaders in the spirit of generating a discussion. Our conclusions are tentative, and certainly not the last word on the subject. There is an obvious need for more research on cohabitation, and the findings of new research, of course, could alter our thinking. What is most important now, in our view, is a national debate on a topic that heretofore has been overlooked. Indeed, few issues seem more critical for the future of marriage and for generations to come.

The National Marriage Project The National Marriage Project is a nonpartisan, nonsectarian and interdisciplinary initiative supported by private foundations and affiliated with Rutgers, the State University of New Jersey.  The Project’s mission is to provide research and analysis on the state of marriage in America and to educate the public on the social, economic and cultural conditions affecting marital success and wellbeing.  The National Marriage Project has five immediate goals: (1) publish The State of Our Unions, an annual index of the health of marriage and marital relationships in America; (2) investigate and report on younger adults’ attitudes toward marriage; (3) examine the popular media’s portrait of marriage; (4) serve as a clearinghouse source of research and expertise on marriage; and (5) bring together marriage and family experts to develop strategies for revitalizing marriage.

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