To do so is to show disrespect for an important gift of the Creator. Sexual intercourse is not only eminently personal, between a man and a woman, but also has a public and even universal dimension. Human reproduction orients sexual activity to the future of the world. The public consequences of sexual intercourse are illustrated by the miracle of birth, and also through the public devastation wrought by sexually transmitted diseases. Only in a lifelong, committed, loving relationship, centered in Christ, can couples hope to fully experience the sacrament of life and love, i.e., marriage.
Unconditional love is what marriage is all about.