Students of covenant theology know well that a covenant is much more than a contract. A contract is an exchange of goods; a covenant is an exchange of persons.
Marriage is one such covenant that God has ordained from the beginning. Spouses give themselves to each other completely and holding nothing back. Therefore the marital embrace is rightly called "renewing the covenant".
This week, Nod-girl was studying the Ten Commandments for an upcoming quiz. I asked her what the 9th Commandment was.
She proudly declared, "You shall not covenant your neighbor's wife."
How right you are, girl.