Human Sexuality

God invented sex. That is why it is not "bad" or "dirty". Nor is it merely neutral, to be used as we please. It is good and holy.

No aspect of the Church's teaching is more misunderstood and rejected today than her unchanging and unchangeable principles of sexual morality. For these cannot be understood except in the context of her vision of man.

Man has not evolved by accident or blind chance. Man has been loved into existence by God. Man is willed by God, deliberately designed, as male and female. That is the first reason why sex is holy.

The second reason is that God has designed and willed not only the existence of sex but also its purpose. It is holy not only because of its origin but also because of its end. That purpose is to be the means of procreating the greatest things in the universe: new persons, with immortal souls. "By transmitting human life to their descendants, man and woman as spouses and parents cooperate in a unique way in the Creator's work" (CCC 372).

Sexual intercourse is like the Consecration of the Mass. It is a human work that God uses as the material means to do the most divine work done on earth. In the Mass, man offers bread and wine, the work of nature and human hands, for God to transform into the Body and Blood of Christ, In sex, man offers his work -- the procreation of a new body -- for God to do his work: the creation of a new soul. God grants priests the incredible dignity of being his instruments in working one of his two greatest miracles. God grants spouses the incredible dignity of being his instruments in working the other...

The principles of sexual morality are essentially unchanging because the meaning of sex is essentially unchanging. They stem from human nature itself, which God designed, not from the changing mores of society, which man designs. God's law is very clear: no adulterated sex, that is, sex outside of marriage. As Holy Mass is the place for Transubstantiation, holy marriage is the place for sex.

Catholic Christianity:A Complete Catechism of Catholic Beliefs based on the Catechism of the Catholic Church by Peter Kreeft