"The major purpose of marriage was to establish paternity and descendants for probate reasons." A purpose? I suppose. The major purpose? No. Who decides to get married? Mostly young couples in love. Do they really say, "You know, we should get married so that when we have children their inheritance will be safe-guarded." Do their friends or parents offer this as a reason? No. What couples typically say is more like, "We should get married because we are passionately devoted to each other and want to spend the rest of our lives together."