In Ephesians chapter 5, the apostle instructs wives to be subject to their own husbands as to the Lord. He instructs husbands to love their wives as Christ loved the church. The apostle finishes his description with these words which make it clear that he is comparing the marriage relationship to the relationship which exists between Christ and the church. This is a very high view of marriage which is sadly lacking in our day. Many view marriage as antiquated and unnecessary.
Cohabitation avoids the trouble and expense of a wedding and divorce.
The loose and easy divorce laws of our day provide an easy out for those who have decided that they no longer love their mate. Something is sadly lacking when the divorce rate equals or exceeds the marriage rate. The marriage is infinitely more than two people living under the same roof as husband and wife. It is more than a physical oneness. It is a oneness that God alone can bring about.