Drawing from his own pastoral experience as a priest and bishop before he became Pope John Paul II, Karol Wojtyla has produced a remarkably eloquent and resourceful defense of Catholic tradition in the sphere of family life and sexual morality. He writes in the conviction that science--biology, psychology, sociology--can provide valuable information on particular aspects of relations between the sexes, but that a full understanding can be obtained only by study of the human person as a whole. Central to his argument is the contrast between the personalistic and the utilitarian views of marriage and of sexual relations. The former views marriage as an interpersonal relationship, in which the well-being and self-realization of each partner are of overriding importance to the other. It is only within this framework that the full purpose of marriage can be realized. The alternative, utilitarian view, according to which a sexual partner is an object for use, holds no possibility of