 As St. Augustine notes, "Intercourse, even with one's legitimate wife, is unlawful and wicked where the conception of the offspring is prevented.Following this argument, Pius XI repeats that the conjugal act is intrinsically tied with procreation, but also acknowledges the unitive aspect of intercourse as licit.The encyclical affirms the Church's opposition to adultery and divorce, and speaks out against the eugenics laws, popular at that time, that forbade those deemed "unfit" from marrying and having children.