Some argue that if a husband and wife remain open to children throughout their marriage, they need not worry about using contraception occasionally. But practicing what is good most of the time does not justify doing what is wrong some of the time.
Even if I see myself as a truthful person “on the whole,” any occasional lie I tell is still a lie, and so is immoral. By such acts, I begin to make myself into the kind of person who lies. This is no less true when we falsify the “language of the body,” speaking total love and acceptance of the other person while denying an essential part of that message.
A couple need not desire or seek to have a child in each and every act of intercourse. And it is not wrong for couples to have intercourse even when they know the wife is naturally infertile, as discussed below. But they should never act to suppress or curtail the life-giving power given by God that is an integral part of what they pledged to each other in their marriage vows. This is what the Church means by saying that every act of intercourse must remain open to life and that contraception is objectively immoral.
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