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Question: Is it sinful to have marital relations during the menstruation of the woman?

Answer: The question of whether marital relations during the menstruation of the woman is sinful or not is hard to answer since ambiguous statements by Pope Pius XI’s encyclical Casti Connubii are interpreted by some to mean that it is allowed. Pope Pius XI explains that a husband and wife may use their marital rights in the proper manner, although on account of natural reasons, new life cannot be brought forth, but his teaching does not define whether it is speaking about the menstruation of the woman or some other sickness or defect of the woman, like the monthly infertility of women.

Pope Pius XI, Casti Connubii (# 59), Dec. 31, 1930: “Nor are those considered as acting against nature who, in the married state, use their right in the proper manner, although on account of natural reasons either of time or of certain defects, new life cannot be brought forth. For in matrimony as well as in the use of matrimonial rights there are also secondary ends, such as mutual aid, the cultivation of mutual love, and the quieting of concupiscence which husband and wife are not forbidden to consider, so long as they are subordinated to the primary end [that is, Procreation of children] and so long as the intrinsic nature of the act is preserved.”

This teaching does not directly address the question of whether it is allowed or not to perform the marital act during the menstruation period of the woman, and so there is some measure of uncertainty whether the Church allows this filthy act to be performed since the Old Testament of the Bible, as well as the Popes, Fathers, Saints and Doctors of the Church throughout the ages, condemned or opposed marital relations during this time period.

Pope St. Gregory the Great, in his “Epistle To Augustine, Bishop of the Angli [English]” (c. 597 A.D.) writes that all women: “are forbidden to have intercourse with their husbands while held of their accustomed sicknesses [menses]; so much so that the sacred law smites with death any man who shall go into a woman having her sickness [Leviticus 20:18].” (Epistles of St. Gregory the Great, Book XI, Letter 64, To Augustine, Bishop of the Angli)

As mentioned, it was forbidden and a capital offense (that is, it was an act that was punished by death and execution) for spouses to have marital relations during the wife’s infertile monthly cycle during the Old Covenant era. This clearly shows us that God does not want spouses to perform the marital act during this time.

Leviticus 20:18 “If any man lie with a woman in her flowers, and uncover her nakedness, and she open the fountain of her blood, both shall be destroyed out of the midst of their people.”

We read in the Old Testament that God had forbidden the marital act by separating the wife from her husband during the infertile monthly menstrual cycle of the woman. Leviticus 15:19: “The woman, who at the return of the month, hath her issue of blood, shall be separated seven days.” Haydock Commentary explains: “Days, not only out of the camp, but from the company of men.” As soon as a woman shows signs of infertility, intercourse would cease. “Thou shalt not approach to a woman having her flowers: neither shalt thou uncover her nakedness” (Leviticus 18:19). Haydock Commentary adds: “Saint Augustine believes that this law is still in force. [On Leviticus 20:18] This intemperance was by a positive law declared a mortal offence of the Jews.”

This wondrous law from God not only diminished the time a couple could have marital relations, but it also prohibited the women from the company of men, and this certainly includes her husband. What was God’s reason for separating the woman from her man you might ask? In truth, God who knows more about human weaknesses and sins than all of humanity combined ordained this so that the temptation to violate His laws and have marital relations during this period would not happen. For most temptations work like this: as long as you take away the source of the temptation, it will always be easier to control.

Ezechiel 18:5-6,9 “And if a man be just, and do judgment and justice, And hath not eaten upon the mountains [that is, of the sacrifices there offered to idols], nor lifted up his eyes to the idols of the house of Israel: and hath not defiled his neighbour’s wife, nor come near to a menstruous woman... he is just, he shall surely live, saith the Lord God.”

Another reason why God made this wondrous law was so that a couple would have marital relations less frequently, which in turn would help them get stronger in resisting and conquering sexual temptations of different kinds. For as we have seen already, those who indulge in the marital act too often commits a sin of gluttony of sorts and will fall more easily into other sins since they do not order their actions in accordance with right reason, but in accordance with their unmortified and sensual desires like animals or brute beasts.

St. Thomas Aquinas (1225-1274) also did not believe that it was lawful, and taught very clearly in his Summa Theologica that it is a sin to knowingly demand the marital debt when a woman is menstruating. He also compared demanding the debt on such occasions with the case of a madman being dangerous to other people, both bodily and spiritually (Summa Theologica, Suppl., Q. 64, Art. 4, Objection 3).

St. Thomas Aquinas, Summa Theologica, Supplement, Q. 64, Art. 3: “Whether it is allowable for a menstruous wife to ask for the marriage debt? On the contrary, "Thou shalt not approach to a woman having her flowers" (Leviticus 18:19) where Augustine observes: "Although he has already sufficiently forbidden this he repeats the prohibition here lest he seem to have spoken figuratively." Further, "All our justices" are become "as the rag of a menstruous woman" (Isaiah 64:6) where Jerome observes: "Men ought then to keep away from their wives [at this time]… so that those parents who are not ashamed to come together in sexual intercourse have their sin made obvious to all": and thus the same conclusion follows.

“I answer that, It was forbidden in the Law to approach to a menstruous woman, for two reasons both on account of her uncleanness, and on account of the [spiritual and bodily] harm that frequently resulted to the offspring from such intercourse. With regard to the first reason, it was a ceremonial precept, but with regard to the second it was a moral precept. For since marriage is chiefly directed to the good of the offspring, all use of marriage which is intended for the good of the offspring is in order. Consequently this precept is binding even in the New Law on account of the second reason, although not on account of the first. Now, the menstrual issue may be natural or unnatural. The natural issue is that to which women are subject at stated periods when they are in good health; and it is unnatural when they suffer from an issue of blood through some disorder resulting from sickness. Accordingly if the menstrual flow be unnatural it is not forbidden in the New Law to approach to a menstruous woman both on account of her infirmity since a woman in that state cannot conceive, and because an issue of this kind is lasting and continuous, so that the husband would have to abstain for always. When however the woman is subject to a natural issue of the menstruum, she can conceive; moreover, the said issue lasts only a short time, wherefore it is forbidden to approach to her. In like manner a woman is forbidden to ask for the debt during the period of that issue.”

We will also see many more quotations from the early Church concerning the traditional teaching against sexual relations during menstruation in the next question.