Here’s Part Two:
860. 2. The Obligation To Render The Marriage Dues.
Frist Principle. As often as one of the parties asks reasonably and seriously for the rendering of the marriage dues, the other is bound in justice to accede to the request; otherwise grave sin is committed.
Explanation. The request must be reasonable and serious.
The request is unreasonable if made in a state of drunkeness, or when one of the parties is seriously ill, or if the request is too frequent or causes scandal to others, or if the act is accompanied by the practice of onanism. — The request is not considered serious if made in the form of a desire rather than a definite will. — But if the request is reasonable and serious, then the other party is obliged in justice to render the marriage debt under pain of grievous sin, as is evident a) from the words of St. Paul quoted above, and b) from the nature of the marriage contract in which the right to sexual intercourse is handed over from one party to the other. This obligation of rendering the marriage dues, although of its nature serious since it is concerned with a grave matter stipulated in a just contract, does admit of parvity of matter. Thus, if the wife were to refuse marital relations once or twice, awaiting a time more suitable to herself, she would not be guilty of grave sin — at least, if the husband is not thereby placed in proximate danger of incontinence or provoked to excessive anger.
It is self-evident that there is no obligation to render these dues if one of the parties has forfeited the right to ask for them by reason of his or her adultery or as the result of severence of conjugal relations having been legitimately obtained.
861. Second Principle. a) In itself there is no obligation to ask for the act proper to the married state, and therefore it is permissible for both parties by mutual free consent to abstain from the act either permanently or for a time; b) but incidentally, by reason of charity, there does exist on occasions such an obligation.
The reason justifying the first part of the principle is that both parties are free to renounce their right to sexual intercourse. Thus Our Lady and St. Joseph, although truly married, freely renounced their right of asking for the marriage dues, and at least temporary continence is usually beneficial in promoting the spiritual life of husband and wife.
The reason for the second part of the principle is that the withholding of marital relations can be the cause of many evils, e.g. danger to chastity, a weakening of married love.
862. 3. Sins of the Married.
Principle. a) Whatsoever is directly and seriously opposed to the benefit of offspring and conjugal fidelity is a grave sin against chastity; b) anything that is done for mere sexual pleasure is a slight sin, provided it is not directly contrary to the offspring or to conjugal fidelity; c) whatever is useful for or necessary to the perfect fulfilment of the conjugal act and the fostering of marital love in not sinful.
Explanation. The second and third parts of this principle are sufficiently evident from what has been said in n. 859 regarding the use of the conjugal act for mere sexual pleasure and the circumstances accompanying the use of the act.
Serious harm is caused to the offspring and conjugal fidelity by:
a) sins of impurity committed with others either in deed or desire;
b) by solitary pollution;
c) by the practice of onanism. Sufficient has been said already in n. 518 sqq. in the treastise on chastity regarding sins belonging to the first and second categories. We must now consider the sin of onanism.
863. Onanism is of two kinds; solitary onanism, which is the same as pollution or self-abuse, and conjugal onanism which is practiced either a) by breaking off the conjugal act before semination**, or b) by the use of various instruments (e.g. a pessary) which prevent the seed of the male reaching its proper place. Here we shall speak of conjugal onanism only.
**note: It is gravely unlawful to wash out the vagina immediately after sexual intercourse with the express intention of expelling the seed or destroying the spermatozoa (by means of a liquid specially prepared for the purpose) so as to prevent conception. However such a washing is lawful if undertaken for hygienic reasons and not immediately after sexual intercourse, for it is certain that in those circumstances conception is not rendered impossible.
Moral Character. Conjugal onanism, no matter in what way it is freely practiced, is always grievously sinful.
Such is the teaching of right reason and of the Church. Right reason testifies clearly that onanism is directly contrary to the procreation of children and to conjugal fidelity and is merely a form of pollution. Furthermore this practice usually has disastrous consequences; the bodily health of both parties is often seriously affected, the birth of children is prevented, families and states are underpopulated, the feelings are exposed to every form of lust. — The Holy Office, May 21, 1851 declared as “scandalous, erroneous, and contrary to the natural law of marriage” the following proposition: “For morally good reasons married people may use marriage in the manner proposed by Onan.” The Sacred Penitentiary, Nov. 13, 1901, replied “It is not permissible to absolve any penitent who refuses to desist from a way of acting which is plainly onanism.”
End Part Two