Lessons of the same-sex marriage debate in the Netherlands. ONLY A FEW YEARS AGO, two prominent demographers hailed the Dutch family as a model for Europe. Somehow the Dutch had managed to combine liberal family law and a robust welfare state with a surprisingly traditional attitude toward marriage. Even as a new pattern of highly unstable parental cohabitation was sweeping out of Scandinavia and across northern Europe, the Dutch were unswayed. To be sure, premarital cohabitation was widespread, but when Dutch couples decided to have children, they got married. At least they used to. Today, marriage is in...