Abstract

The author uses the central insight of the principle of double effect—that the distinction between intended effects and foreseen side effects is morally significant—to distinguish contraception from natural family planning. After summarizing the contralife argument against contraception, the author identifies limitations of arguments presented by Pope John Paul II and by Martin Rhonheimer. To show that the contralife argument does not apply to NFP, the author argues that agents do not intend every effect that motivates their actions. This argument supplements the action theory of Germain Grisez, Joseph Boyle, John Finnis, and other proponents of new natural law theory. National Catholic Bioethics Quarterly 11.1 : 83–97.