This chapter examines the many “legal incidents” of marriage: the specific benefits, responsibilities, obligations, and protections that are associated with marriage by law. While critics focus on the special privileges or benefits that spouses acquire in marriage, those are balanced by special obligations. The chapter suggests that the whole package seems reasonably appropriate for both opposite-sex and same-sex couples. It also considers the ways in which marriage seems to promote the good of spouses, children, and society, along with the class divide that now characterizes marriage and parenting. It argues that this class divide, not same-sex marriage, is the great challenge for the future.