Catechism 2366–2372

Because it holds that the two meanings of sex — union and openness to life — are not ours to separate. The same teaching permits couples to space births by natural means, for serious reasons.

What the Church Teaches

Marriage and married love are by their nature ordered to the procreation and education of children (CCC 2366). The Church teaches that each conjugal act must remain open to life, and that every action which deliberately renders procreation impossible is intrinsically wrong (CCC 2370, quoting Humanae Vitae).

The same paragraph makes a distinction that is often missed. Couples may, for just reasons, space births — using periodic continence and the infertile periods. The Church regards that as morally different in kind, not merely in method: it respects the bodies as they are rather than suppressing what they do.

And the Catechism insists on responsible parenthood in both directions: the decision about the number of children belongs to the parents, weighing their own good and that of their children, and is not to be made either selfishly or under external pressure (CCC 2368).

Where This Comes From

Every Christian body taught this until 1930, when the Anglican Lambeth Conference first permitted contraception in limited circumstances; the others followed within decades. The Catholic Church did not, and Paul VI restated the teaching in Humanae Vitae in 1968, against the expectation of most commentators and a good many of his own advisers.

The reasoning is about what the act says. Sex, in the Church’s account, speaks a language: total self-gift, holding nothing back. Deliberately withholding fertility introduces a reservation into a gesture whose whole meaning is that nothing is reserved.

Common Misunderstandings

• "The Church wants Catholics to have as many children as possible." It does not. Responsible parenthood is taught explicitly, and spacing births for serious reasons is legitimate (CCC 2368, 2370).
• "Natural family planning is just Catholic contraception." Both may aim to avoid conception. The Church’s judgment turns on whether the act itself is deliberately made sterile — a distinction critics find thin and the Church regards as decisive.
• "The rhythm method doesn’t work." Modern symptothermal and hormonal-marker methods are considerably more precise than the calendar rhythm of the 1950s, and studies of correct use report effectiveness comparable to hormonal contraception.
• "Hormonal medication is always forbidden." No. Treatment prescribed for a genuine medical condition is permitted even where a side effect is temporary infertility — the principle of double effect (CCC 1737).

What It Means in Practice

Most Catholic couples who take this seriously learn a method properly, from an instructor rather than a book, and find the first year the hardest. Many dioceses offer courses. If this teaching is where you and the Church part company, say so honestly in Confession and keep the conversation open — that is a better position than silence in either direction.

Pray With This

• Prayer for Married Couples
• Prayer for Those Hoping to Conceive
• Prayer for Expectant Mothers
• Prayer for Discernment

In the Catechism

• 2366–2367 — fecundity and the meaning of the marriage act
• 2368–2369 — responsible parenthood
• 2370–2372 — periodic continence and contraception

Read the full text at vatican.va.