The justifications we often hear for the cohabitation option amount to tired old clichés like “You wouldn’t buy a car until you’d driven it,” or “Well, we plan to make the commitment of marriage after we are sure it is going to work.” The problem with this logic is that what makes a marriage work is the commitment. Commitment is the start of a relationship that lasts, not the culmination of it. And the commitment of marriage is what lends security both to husband and wife and to the children that join them.