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Unnatural sexual acts (always gravely sinful). An unnatural sexual act or touch is any type of sexual act that is not natural, reasonable, or procreative. Some examples of unnatural sexual acts include shameful acts with the mouth, sodomy, acts performed on different parts of the body not intended for this purpose, and manipulative sexual acts (i.e. masturbation of self or the spouse). All unnatural sexual acts are intrinsically evil and always gravely immoral because these acts lack the natural and procreative meaning, and therefore right reason, which are required by God for sexual acts to be moral. These acts are not procreative because they are not the type of act that is inherently directed at procreation. This is not the type of sexual union intended by God for human persons. Unnatural sexual acts are not justified by being done within marriage, nor by the circumstance that these acts occur in connection to or the context of natural marital relations, because the moral law requires each and every sexual act to be not only reasonable and marital, but also natural and procreative. All unnatural sexual acts and embraces are thus intrinsically evil and always gravely immoral due to the deprivation of the procreative purpose and right reason that always must accompany the marital act.

Examples of things a couple could do to inflame concupiscence accidentally (and that are bad, since it enhance lust!) but that are perhaps not sinful in every case depending on the intentions of the spouses while they’re doing it, is to have marital relations in light instead of in darkness, to come together naked or partially naked instead of clothed, or to touch each other more than what is absolutely necessary during the marital act by hugs and the like. All of these things however should be avoided by the spouses as much as possible in order to cultivate a virtuous, honorable and good marriage. In truth, the inflaming of concupiscence usually starts out as a venial sin and if continued always ends in mortal sin, because all control is lost. “Go not after thy lusts, but turn away from thy own will.” (Ecclesiasticus 18:30)

Appropriate sexual position

Christian moralists, canonists, and theologians from the patristic period onward commonly maintained that only one posture was appropriate and natural for human sexual intercourse.

St. Albertus Magnus the Great, Doctor of the Church, (c. 1206-1280): “Nature teaches that the proper manner is that the woman be on her back with the man lying on her stomach.” (Commentarii in IV Sententiarum (Dist. XXIII-L))

Deviation from this was sanctioned only when illness or physical obesity necessitated or when there was danger of smothering the foetus in the advanced stages of pregnancy.

Many readers will undoubtedly question why the missionary position would be considered as the only appropriate form of sexual intercourse between a husband and wife. The simple answer to this question is because of the natural order of the hierarchy so established by God, because in marriage the husband is the head of the wife.

Ephesians 5:23 “Because the husband is the head of the wife, as Christ is the head of the church. He is the savior of his body.”

The missionary position is simply a bodily manifestation of this. If it were otherwise, the woman would be more like a man (more like the head and in control) and the man more like a woman (more submissive and receptive), which is contrary to nature.

Genesis 1:27 “And God created man to his own image: to the image of God he created him: male and female he created them.”

St. Thomas Aquinas teaches the same concept in his “Summa Theologica”:

“These species are differentiated on the part of the woman rather than of the man, because in the venereal act the woman is passive and is by way of matter, whereas the man is by way of agent [in way of acting]...” (St. Thomas Aquinas, Summa Theologica, Second Part of the Second Part, Q. 154, Art. 1)

Thus, the Catholic Church teaches that any sexual position performed by the spouses where the woman is by way of agent, (that is, when she is more in control of the sexual act with her movements) is contrary to nature and tradition, in addition to the natural hierarchy so established by God.

But there are also other reasons why the Church commonly have recommended only the missionary position. The most obvious reason, of course, is because these other positions or “experimentations” are usually more “exciting” to people who practice them, since it enhances their lust and gives them greater levels of pleasure or enjoyment than they otherwise would have, in addition to making the act more bestial. So that’s why Church tradition holds as contrary to nature those other positions. The Church has as it’s main goal the preservation of morality and the salvation of souls, and not that of appeasing stiff-necked, lust-seeking couples who are searching for new ways to damn themselves. The Angelic Doctor, St. Thomas Aquinas, who was well aware of the sexual depravity of humankind, wonderfully refers to these most obvious reasons in his writings as well.

St. Thomas Aquinas, In Libros Sententiarum, Chapter IV, Section 31, 2, 3: “Marital relations are contrary to nature when either the right receptacle or the proper position required by nature is avoided. In the first case it is always a mortal sin because no offspring can result, so that the purpose of nature is completely frustrated. But in the second case [of inappropriate sexual positions] it is not always a mortal sin, as some say, though it can be the sign of a passion which is mortal; at times the latter can occur without sin, as when one’s bodily condition does not permit any other method. In general, this practice is more serious the more it departs from the natural way.”

St. Thomas Aquinas’ mentor, St. Albertus Magnus the Great, also a Doctor of the Church, taught that to depart from the “natural position” for human intercourse, the husband on top of his wife, was to become like the “brute animals.” (Albert the Great, On the Sentences, 4.31.24) St. Thomas Aquinas elaborated on that concept, teaching that: “by not observing the natural manner of copulation, either as to undue means, or as to other monstrous and bestial manners of copulation,” the married couple commits sin by going “contrary to the natural order of the venereal act as becoming to the human race.” (St. Thomas Aquinas, Summa Theologica, I:II, q. 154, art. 11)

In truth, “Some, then, as we have shown, have tried to go beyond what is right and the concord that marks salvation which is holy and established. … They have abandoned themselves to lust without restraint and persuade their neighbors to live licentiously; as wretches they follow the Scripture: "Cast your lot in with us; let us all have a common purse and let our moneybag be one." [Prov. 1:14] On account of them the same prophet gives us advice saying: "Go not in the way with them, withdraw thy foot from their steps. For not unjustly are nets spread out to catch birds; for they are guilty of bloodshed and treasure up evil for themselves" [Prov. 1:15-18] that is, they seek for immorality and teach their neighbors to do the same. According to the prophet they are "fighters struck with their own tails" (ourai), to which the Greeks give the name kerkoi. Those to whom the prophecy refers might well be lustful, incontinent, men who fight with their tails, children of darkness and wrath… And again in anger at such people he directs that we should "have no fellowship with any one called a brother if he is a fornicator or covetous man or idolater or reviler or drunkard or robber; with such a man one ought not even to eat." [1 Cor. 5:11] "For I through the law am dead to the law," he says, "that I may live unto God. I am crucified with Christ; it is no longer I that live," meaning that I used to live according to my lusts, "but Christ lives in me," and I am pure and blessed by obeying the commandments; so that whereas at one time I lived in the flesh carnally, "the life which I now live in the flesh I live by faith in the Son of God" [Gal. 2:19-20].” (St. Clement of Alexandria, The Stromata or Miscellanies, Book III, Chapter XVIII, Section 105-106)

Kisses and touches performed for sensual motives is condemned as a mortal sin by the Catholic Church and Her Saints for both married and unmarried alike