Section — Slater, Manual of Moral Theology

3. Lust

1.

Lust is an inordinate appetite for the pleasure which has its seat in the organs of generation. A wise and provident Creator has taken care that those actions which are most necessary for the individual or for society should be accompanied by great pleasure in order that they may be exercised more certainly and more readily. If there were no pleasure connected with eating and drinking, few men would trouble themselves about those necessary actions. The great pleasure felt in the act of procreation induces men to do what is necessary for the preservation of the race which otherwise would excite only shame and disgust. This, however, can only be done lawfully in wedlock. It is lawful then, according to the rules of married life, for husband and wife to indulge in venereal pleasure; outside marriage it is inordinate and sinful.

p. i, 100

2.

Any act of wrongful indulgence in venereal pleasure by those who are not married is grievously sinful if directly sought for or to which deliberate consent is given. But the fuller treatment of this subject must be left till we come to the Sixth and Ninth Commandments.

p. i, 100