(c) If there is remote danger of material pollution, a serious reason suffices (e.g., customary salutations of the country, physical exercises, moderate comfort in posture, seasoning in food.). A slight reason may excuse at times from mortal sin (e.g., unnecessary curiosity about the sciences of anatomy or sexology).
2539. The Theological Malice of Sinful Pollution.—(a) From its nature pollution is a mortal sin, because it is an act of impurity (1494) and a perversion of nature (2534). Moreover, its consequences are most injurious to society (it tends to self-indulgence and the avoidance of the burdens of marriage) and to the individual (when habitual, it weakens mental and will power and often brings on a breakdown of bodily vigor especially among young people), In Scripture it is represented as gravely illicit (I Cor., vi. 10; Gal., v. 19; Eph., v. 3). Hence, pollution is always a mortal sin when directly willed (e.g., when practised deliberately in order to be rid of a temptation or of bodily irritation or itch certainly due to superfluity of semen or to passion), and also when indirectly willed if there is proximate danger of consent to sin (e.g., when one who has always committed formal pollution in certain company goes into that company without necessity, or without use of means to prevent a fall) or grave danger of pollution and no sufficient reason for permitting it (e.g., undue familiarities from which nocturnal pollution is foreseen as most probable).
(b) From the imperfection of the internal act, pollution is sometimes only a venial sin. This happens in case of invincible ignorance (e.g., young children who do not understand the evil of masturbation, students who have been taught by instructors or physical directors that it is necessary for health or that it is unsanitary but not sinful), or of incomplete consent (e.g., when the person is only half awake and does not ordinarily desire pollution, when he is a psychopathic and not fully responsible for his acts).
(c) From the lightness of the matter pollution is venial when willed indirectly and permitted without sufficient reason, if there is only slight danger of it from the nature of the action performed (see 2496). Examples are the reading for pastime of love stories before falling asleep with the prevision that this may possibly bring on pollution during sleep.
2540. If the action productive of pollution is gravely illicit, as being seriously opposed to chastity (e.g., lewdness) or to some other virtue (e.g., extreme intemperance in drugs or alcohol), is one thereby guilty of the grave sin of pollution?
(a) If the case be considered in the abstract, the answer is in the negative. For if the action in question is only remotely dangerous as regards pollution (e.g., an action of a non-venereal kind such as intemperance does not necessarily tend to impurity, an act of a venereal kind that is momentary, such as a desire, does not strongly affect the passions), the sin is only venial in so far as pollution is concerned (see 2517, 2518).
(b) If the case be considered in the concrete, the answer is in the affirmative as a rule when there is question of a habit. For generally those who act habitually in this way yield consent to the pollution as well as to the sin that precedes. Authorities note, however, that he who repents of the cause of pollution before the pollution results is not guilty of the actual pollution.
2541. The Moral Species of Sinful Pollution.—(a) The general species of pollution is distinct from other consummated sins of impurity, since it is unnatural, and this in a special way (see 2534, and Denzinger, n. 1124), But some authors regard equivalent pollution (see 2493, 2535) as not a consummated sin, since it is without true semination, and hence according to them it may be confessed simply as impure pleasure (see 2519 b).
(b) The particular species of pollution is derived from circumstances that give it a new essential malice. If it is solitary, and committed by one who is under no bond of marriage or vow, and accompanied by no thought or desire except in reference to self or self-gratification (autoerotism, narcissism), there is the single sin of pollution. But there are other sins if it is committed by one under special obligation (i.e., adultery or sacrilege), or if committed with another person (e.g., seduction, cooperation, rape), or if committed with impure thoughts or desires about others (e.g., mental adultery, fornication, sodomy, bestiality). The manner in which pollution is performed (e.g., whether cooperative pollution is active or passive, by irrumation or concubitus or touch, with or without an instrument) is _per se_ an accidental circumstance. According to some authors, cooperative pollution brought on by touch alone is not diversified in species, if there is no special affection for the other person, but only the desire of carnal gratification, and hence it may be declared simply as pollution from touch.
2542. Penalties for Immorality Decreed in Canons 2357-2359.—(a) Laymen who are guilty of certain offenses against the sixth commandment become infamous on conviction and are excluded from legitimate ecclesiastical acts. In case of adultery, the injured spouse may obtain a separation, temporary or perpetual, from the offending spouse (Canon 1129). (b) Clerics in minor orders are subject to special punishments, and may even be dismissed from the clerical state. (c) Clerics in major orders are subject to penalties named in law (e.g., suspension, infamy, deposition) for graver crimes such as concubinage, adultery, and to penalties decreed by the lawful superior for other delinquencies.