[he Catholic Church's traditional teaching about sex education, especially as formulated by Popes Pius XI and Pius XII, is that it should not be primarily a matter of giving explicit information at all, but rather it should be a matter of inculcating modesty, purity, chastity, and morality, a matter of teaching the sixth and ninth commandments. Moreover, it should also be primarily a matter for the parents to impart privately in the home, not something to be purveyed and discussed in mixed classrooms of boys and girls at impressionable ages...And in its Pastoral Constitution on the Church in the Modern World, Gaudium et Spes, Vatican II takes up the same theme again, stipulating that especially in the heart of their own families, young people should be aptly and seasonably instructed about the dignity, duty, and expression of married love. Trained thus in the cultivation of chastity, they will be able at a suitable age to enter a marriage of their own after an honorable courtship (emphasis added). Thus, if there is anything than can rightly be called Catholic sex education, it cannot be anything else but an education in chastity imparted by the parents or in close collaboration with and in support of the parents.