Claim. Conjugal love is holy because only the spouse holds the key to love’s holy place and to the birth of children.
Elaboration. SMM describes the development of conjugal love from lips to breasts to the sexual organ, then calls the woman’s sexual organ “the holy place of love” whose key is held only by her husband (CSG 4.7 §6, Blessed Family 894). If there are multiple keys, the relation becomes satanic; exclusivity protects love’s holiness and lineage. Children born through this love are “an encapsulation of love” and teach parents the heart by which God created Adam and Eve. The same section insists that marital sexuality centered on God is “most dignified, holy, and beautiful.” Shame belongs to fallen history, not to blessed conjugal love rightly ordered.