"The Church’s teaching on contraception can only be rightly understood in the context of its wider teaching on the nature and goods of marriage. But the norm itself against contraceptive acts, taught and defended since the early Church, binds universally — in the language of moral theology, ‘’semper et pro semper’’, without exception. It singles out a particular type of freely chosen behavior, namely, deliberate acts intended to render sexual intercourse infertile. Sexual intercourse, the tradition holds, is legitimate and good (and, for Christians, grace-imparting) when and only when it is marital. Marriage is a one-flesh communion of persons with two defining goods: the unity and perfection of the spouses and the procreation and education of children. Intercourse that is marital will always respect the full one-flesh significance of the marital relationship by retaining a unitive and procreative character."