Moral Theology / A Complete Course Based on St. Thomas Aquinas and the Best Modern Authorities

by John A. McHugh; Charles J. Callan

All theologians agree that the use of marriage during the sterile period is not _per se_ illicit. The act is performed in the natural way; nothing has been done positively to avoid conception; and the secondary ends of matrimony, mutual love and the quieting of temptation, have been fostered. “If the carrying out of this theory means nothing more than that the couple can make use of their matrimonial rights on the days of natural sterility, too, there is nothing against it, for by so doing they neither hinder nor injure in any way the consummation of the natural act and its further natural consequences” (Pope Pius XII, ibid.).

“If, however, there is further question—that is, of permitting the conjugal act on those days exclusively—then the conduct of the married couple must be examined more closely” (ibid).

The following points summarize papal teaching on this aspect:

1) A premarital agreement to restrict the marital right and not merely the use to sterile periods, implies an essential defect in matrimonial consent and renders the marriage invalid. 2) The practice is not morally justified simply because the nature of the marital act is not violated and the couple are prepared to accept and rear children born despite their precautions. 3) Serious motives, (medical, eugenic, economic and social), must be present to justify this practice. When present, they can exempt for a long time, perhaps even for the duration of the marriage, from the positive obligations of the married state. 4) The married state imposes on those who perform the marital act the positive obligation of helping to conserve the human race. Accordingly, to make use of the marital act continuously and without serious reason to withdraw from its primary obligation would be a sin against the very meaning of conjugal life (ibid.).

Pope Pius explicitly confirmed the common teaching of theologians: 1) Rhythm, by mutual consent, for proportionate reasons, and with due safeguards against dangers would be licit. 2) Without a good reason, the practice would involve some degree of culpability. Not expressly confirmed, but simply an expression of common moral principles is the common agreement: 3) That the sin could be mortal by reason of injustice, grave danger of incontinence, serious family discord, etc.

Since the Allocution, the more common opinion in this country asserts that the Holy Father taught: 1) that married people who use their marital right have a duty to procreate; 2) that this duty is binding under pain of sin; 3) there are, however, reasons that excuse the couples from this obligation and, should they exist for the whole of married life, the obligation does not bind them at all; 4) the sin does not consist in the exercise of marital rights during the sterile periods; but in abstention from intercourse during the fertile periods precisely to avoid conception, when the couple could have and should have made its positive contribution to society. Sin is present when the practice is unjustifiedly undertaken; 5) the formal malice of illicit periodic continence is not against the sixth commandment; i.e., against the procreation of children or the use of the generative faculty, but against the seventh commandment, i.e., against social justice. The couple is not making its contribution to the common good of society; 6) from 4 and 5 above, it follows that the individual acts of intercourse during a period of unjust practice of rhythm do not constitute numerically distinct sins. Rather, granting the continuance of a single will act to practice rhythm, there is one sin for the whole period of illicit abstention during the fertile periods.

Since the Pope abstained from an explicit statement on the gravity of the sin, the controversy of whether the practice intrinsically is a mortal sin or not continued. The opinion in this country which holds the greatest authority states that mortal sin is involved in the case of continued practice with a total exclusion of children and frequent use of marital rights during the sterile period.

Diversity of opinion has arisen as to the means of estimating when a serious sin has been committed. Some have used a temporal norm, e.g., unjustified use of rhythm for five or six years would constitute a serious matter. Undoubtedly most of the proponents of this norm would not accuse a couple of certain mortal sin if they already have one or more children; after that, indefinite use of the practice without excusing causes would not be a mortal sin. (This is admitted by most theologians.) Others have proposed a numerical norm as a basis to determine whether or not a couple has made its contribution to the conservation of the race. Concretely the proponents of this theory regard four or five children as sufficient to satisfy the obligation in such a way;

a) that the use of rhythm to limit the family to this number is licit provided the couple is willing and morally able to practice it;

b) that the limitation through rhythm to less than four requires a serious justifying cause. The intention involved to prevent conception would be seriously sinful in itself, since it causes great harm to the common good and involves in practice subordination of the primary to the secondary end or ends of matrimony. At the present time this opinion seems to be more favored in America than the first which places the gravity of the sin in the unjustified practice of rhythm for five years. (For a survey of recent opinion, see the _Conference Bulletin of the Archdiocese of New York_, Vol. XXXIV, No. 1, pp. 36 ff.)