Likelihood of split
Conflicting studies on the effect of cohabitation on subsequent marriage have been published. In countries where the majority of people disapprove of unmarried individuals living together, or a minority of the population cohabits before marriage then marriages resulting from cohabitation are more prone to divorce. But in a study on European countries, those where around half of the population cohabits before marriage, cohabitation is not selective of divorce-prone individuals, and no difference in couples that have cohabited before and after marriage is observed.[30][31] In countries such as Italy, the increased risk of marital disruption for people who experienced premarital cohabitation can be entirely attributed to the selection of the most divorce-prone into cohabitation.[32]
In 2002 the CDC found that for married couples the percentage of the relationship ending after 5 years is 20%, for unmarried cohabitators the percentage is 49%. After 10 years the percentage for the relationship to end is 33% for married couples and 62% for unmarried cohabitators. [33] [34]
A 2004 study of 136 couples (272 individuals) from researchers at the University of Denver found differences among couples that cohabited before engagement, after engagement, or not until marriage. The longitudinal study collected survey data collected before marriage and 10 months into marriage, with findings suggesting those who cohabit before engagement are at greater risk for poor marital outcomes than those who cohabit only after engagement or at marriage.[35] A followup survey by the researches of over 1,000 married men and women married in the past 10 years found those who moved in with a lover before engagement or marriage reported significantly lower quality marriages and a greater possibility of a separation than other couples. [36] About 20 percent of those who cohabited before getting engaged had since suggested splitting -