Catechism of the Catholic Church

576 Part Three 2395 Chastity means the integration of sexuality within the person. It includes an apprenticeship in self-mastery. 2396 Among the sins gravely contrary to chastity are mas­ turbation, fornication, pornography, and homosexual practices. 2397 The covenant which spouses have freely entered into entails faithful love. It imposes on them the obligation to keep their marriage indissoluble. 2398 Fecundity is a good, a gift and an end of marriage. By giving life, spouses participate in God’s fatherhood. 2399 The regulation of births represents one of the aspects of responsible fatherhood and motherhood. Legiti­ mate intentions on the part of the spouses do not jus­ tify recourse to morally unacceptable means (for example, direct sterilization or contraception). 2400 Adultery, divorce, polygamy, and free union are grave offenses against the dignity of marriage.