35. The engaged should receive instruction regarding the natural requirements of the interpersonal relationship between a man and a woman in God's plan for marriage and the family: awareness regarding freedom of consent as the foundation of their union, the unity and indissolubility of marriage, the correct concept of responsible parenthood, the human aspects of conjugal sexuality, the conjugal act with its requirements and ends, and the proper education of children. All of this is aimed at knowing the moral truth and forming the personal conscience.

Proximate preparation should certainly ascertain whether the engaged have the basic elements of a psychological, pedagogical, legal and medical nature for marriage and family life. However, especially with regard to total self-giving and responsible procreation, the theological and moral formation will have to be given in a particular way. In fact, conjugal love is total, exclusive, faithful and fruitful (cf. Humanae Vitae, 9).

Today the scientific basis2 of the natural methods for the regulation of fertility are recognized. Knowledge about these methods is useful. When there is just cause, their use must not only be a mere behavioral technique but be inserted into the pedagogy and process of the growth of love (cf. EV 97). Then the virtue of chastity will lead the spouses to practice periodic continence (cf. Catechism of the Catholic Church, nos. 2366-2371).

This preparation should also ensure that Christian engaged persons have correct ideas and a sincere "sentire cum ecclesia" regarding marriage itself, the mutual roles of a woman and a man in a couple, the family and society, sexuality and openness towards others.