Again, this is Puritanism with a Catholic veneer. You can always recognize it by the primary idea: that sex is something bad, something dirty, something to be avoided for its own sake. On the contrary, sex in itself is something GOOD, having been created by a perfect God. He designed it. It is good and beautiful. It is only the devil's warping of marital love into selfish lust, promiscuity, and other degradations (ɧoɱosɛҳųαƖity, etc.) that is evil.

11. Thus amongst the blessings of marriage, the child holds the first place. And indeed the Creator of the human race Himself, Who in His goodness wishes to use men as His helpers in the propagation of life, taught this when, instituting marriage in Paradise, He said to our first parents, and through them to all future spouses: "Increase and multiply, and fill the earth."
[12] As St. Augustine admirably deduces from the words of the holy Apostle Saint Paul to Timothy[13] when he says: "The Apostle himself is therefore a witness that marriage is for the sake of generation: 'I wish,' he says, 'young girls to marry.' And, as if someone said to him, 'Why?,' he immediately adds: 'To bear children, to be mothers of families'."[14]

12. How great a boon of God this is, and how great a blessing of matrimony is clear from a consideration of man's dignity and of his sublime end. For man surpasses all other visible creatures by the superiority of his rational nature alone. Besides, God wishes men to be born not only that they should live and fill the earth, but much more that they may be worshippers of God, that they may know Him and love Him and finally enjoy Him for ever in heaven; and this end, since man is raised by God in a marvelous way to the supernatural order, surpasses all that eye hath seen, and ear heard, and all that hath entered into the heart of man.[15] From which it is easily seen how great a gift of divine goodness and how remarkable a fruit of marriage are children born by the omnipotent power of God through the cooperation of those bound in wedlock.

I was aware that the first excerpt came from a dodgy source (vice often renders homage to virtue), but it accurately sums up the mind of the Church Fathers on this matter. My point stands: adherents of '50s-ist porno-theology like Matthew and the Puritans of yesteryear are on the same side here, in opposition to genuine Catholic tradition.

Wasn't aware that Pius XI said anything along these lines:

Again, this is Puritanism with a Catholic veneer. You can always recognize it by the primary idea: that sex is something bad, something dirty, something to be avoided for its own sake. On the contrary, sex in itself is something GOOD, having been created by a perfect God. He designed it. It is good and beautiful. It is only the devil's warping of marital love into selfish lust, promiscuity, and other degradations (ɧoɱosɛҳųαƖity, etc.) that is evil.