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I may be wrong about this, but I thought that the Church also considers it to be important in maintaining strong marriages. Am I incorrect?
Theology of the Body addresses how the physical expression of love is necessary for a strong marriage, since it is the physyical expression of a physical reality. People are mental, spiritual and physical beings. They must be united in all three to truly be married.
It’s not by accident that God created oxytocin to be released during the marital act. You do physically bond to your spouse. At least women do.
One problem protties have is they see the world ina linear fashion. The Sacrament of Holy Matrimony confers many Graces. Children, pleasure, companionship, mutual support both natural and supernatural. If I get to Heaven it will be in no small part due to my wonderful wife. (She is the living example of what a wife can and should be, imho.)