The Church’s teaching on marriage and on the complementarity of the sexes reiterates a truth that is evident to right reason and recognized as such by all the major cultures of the world. Marriage is not just any relationship between human beings. It was established by the Creator with its own nature, essential properties and purpose. No ideology can erase from the human spirit the certainty that marriage exists solely between a man and a woman, who by mutual personal gift, proper and exclusive to themselves, tend toward the communion of their persons. In this way, they mutually perfect each other, in order to cooperate with God in the procreation and upbringing of new human lives.
The natural truth about marriage was confirmed by the Revelation contained in the biblical accounts of creation, an expression also of the original human wisdom, in which the voice of nature itself is heard. There are three fundamental elements of the Creator’s plan for marriage, as narrated in the Book of Genesis.
. . . Sexuality is something that pertains to the physical-biological realm and has also been raised to a new level – the personal level – where nature and spirit are united.
Marriage is instituted by the Creator as a form of life in which a communion of persons is realized involving the use of the sexual faculty. “That is why a man leaves his father and mother and clings to his wife and they become one flesh” (Gen 2:24).
Third, God has willed to give the union of man and woman a special participation in his work of creation. Thus, he blessed the man and the woman with the words “Be fruitful and multiply” (Gen 1:28). Therefore, in the Creator’s plan, sexual complementarity and fruitfulness belong to the very nature of marriage.
Furthermore, the marital union of man and woman has been elevated by Christ to the dignity of a sacrament. The Church teaches that Christian marriage is an efficacious sign of the covenant between Christ and the Church (cf. Eph 5:32). This Christian meaning of marriage, far from diminishing the profoundly human value of the marital union between man and woman, confirms and strengthens it (cf. Mt 19:3-12; Mk 10:6-9).
There are absolutely no grounds for considering homosexual unions to be in any way similar or even remotely analogous to God’s plan for marriage and family. Marriage is holy, while homosexual acts go against the natural moral law. Homosexual acts “close the sexual act to the gift of life. They do not proceed from a genuine affective and sexual complementarity. Under no circumstances can they be approved”.
