And while the study's findings did confirm this, there was a nuance that is somewhat surprising. Couples in which one person was a heavy drinker were much likelier to divorce than other couples, with a 50% divorce rate. Couples with two heavy drinkers had a 30% divorce rate, as did couples with no heavy drinkers at all. How does mutual heavy drinking result in seemingly stable marriages? Says Kenneth Leonard, the author of this study, "Our results indicate that it is the difference between the couple's drinking habits, rather than the drinking itself, that leads to marital dissatisfaction, separation and divorce." To read more, click here