Against the revisionists, Girgis, George and Anderson argue that only the traditional, or “conjugal”, definition can give a robust and comprehensive explanation of marriage. While they are convincing, and What is Marriage is rigorously argued, they won’t win points for readability. Here is their definition of marriage:
Marriage is that type of community that is both a comprehensive unity (a unity on all levels of the human person, including the bodily-sexual) and a community that would be fulfilled by procreating and rearing children together. Moreover, there is an intrinsic link between these two aspects of the community; the comprehensive (and therefore intrinsically sexual) relationship is fulfilled by, and is not merely incidental to, the procreating and rearing of children.

