- Saint Augustine condemned this type of sexual behavior within marriage as gravely immoral.
“…nor be changed into that use which is against nature, on which the Apostle could not be silent, when speaking of the excessive corruptions of unclean and impious men…. by changing the natural use into that which is against nature, which is more damnable when it is done in the case of husband or wife.” (Augustine, On the Good of Marriage, section 11).
“For, whereas that natural use, when it pass beyond the compact of marriage, that is, beyond the necessity of begetting, is pardonable in the case of a wife, damnable in the case of an harlot; that which is against nature is execrable when done in the case of an harlot, but more execrable in the case of a wife…. But, when the man shall wish to use the member of the wife not allowed for this purpose, the wife is more shameful, if she suffer it to take place in her own case, than if in the case of another woman.” (Augustine, On the Good of Marriage, section 12).
- In Theologia Moralis, Saint Alphonsus Liguori dealt with the specific question of a wife using “touches” subsequent to marital intercourse to obtain climax. He condemned this behavior because it is neither procreative nor unitive.
- As Pope Pius XII taught in Address to Midwives:
"66. If nature had aimed exclusively, or at least in the first place, at a reciprocal gift and possession of the married couple in joy and delight, and if it had ordered that act only to make happy in the highest possible degree their personal experience, and not to stimulate them to the service of life, then the Creator would have adopted another plan in forming and constituting the natural act. Now instead, all this is subordinated and ordered to that unique great law of the “generatio et educatio prolis,” [the generation and education of offspring] namely the accomplishment of the primary end of matrimony as the origin and source of life.
"67. Unfortunately, unceasing waves of hedonism invade the world and threaten to submerge, in the swelling tide of thoughts, desires, and acts, the whole of marital life, and not without serious dangers and grave prejudice to the primary duty of husband and wife.
“68. This anti-Christian hedonism too often is not ashamed to elevate itself to a doctrine, inculcating the ardent desire to make always more intense the pleasure, in the preparation and in the performance of the conjugal union, as if in matrimonial relations the whole moral law were reduced to the normal performance of the act itself, and as if all the rest, in whatever way it is done, were justified by the expression of mutual affection, were sanctified by the Sacrament of Matrimony, and made worthy of praise and reward before God and conscience. There is no thought at all of the dignity of man and of the Christian – a dignity which restrains the excess of sensuality.”
Unnatural sexual acts are intrinsically evil and always gravely immoral because they are deprived of both the procreative and unitive meanings. I do not want any of my fellow Catholics to be led into committing grave sexual sins within marriage. For holy Matrimony is a Sacrament, and the Sacrament includes marital relations.