Two of the world’s leading scholars on the harmful impact of cohabitation on relational health and marital success – Scott Stanley and Galena Rhoades, both of the University of Denver – have published an important new report expanding upon previous research. Scholars have long known, and there is surprisingly very little disagreement among them, that cohabiting relationships are associated with markedly higher rates of marital divorce. Something about the cohabiting experience tends to chip away at the likelihood of success in marriage. These scholars explain in this new report that “for decades in the U.S., living together before marriage has...