In this essay I will ask if getting married and remaining married are rational things for a reflective person to do. I will limit my discussion to marriage within the western tradition. Most people in this tradition marry at some point in their lives. When they do, they are usually thought to be doing something worthwhile. Yet all too many marriages end in disappointment and divorce. So is it rational for us to choose to bind ourselves to another person in perpetuity in this way? To answer this question, I will begin by examining the sociobiological thesis which claims that human beings are gene-governed to pair bond. If this is correct, it might be thought that it explains the practice of marriage. However I will show that one implication ...