For a married Christian couple, they follow Jesus by giving themselves to each other completely and without any reservation.
They promise to love each other faithfully for the rest of their lives. They agree to share their joys and sorrows in whatever circumstances life presents to them.
They express their love through their sexual union, which brings them together in the closest intimacy and opens them to the gift of new life in their children.
Click here for more on the sacrament of marriage in the Catholic Church.