Paul M. Quay, S.J. The unique gift of human sexuality allows us to choose, or not to choose, to participate in one form of God's creation. This little book attempts to sketch, without learned apparatus, the understanding of human sexuality that divine revelation offers us. It is intended primarily for Christian adults who wish not only to know what kinds of sexual behavior are right or wrong but to gain true insight into why such behavior is right or wrong for those who seek to love and live in Christ. For, sexual morality is part of the mystery of our life in Christ and makes full sense only when seen as such. Understanding of this Christian mystery, so far as we are given access to it, is offered us through the Scriptures and the living Tradition of the Church. This book uses Scripture and the teaching of the Fathers of the early Church to show what sexuality means in Christian terms. It is an indispensable guide to learning not just what the Church teaches, but why. Quay's insightful descriptions of the complementarity of male and female, a complementarity that is psychological, spiritual and bodily are exceptionally illuminating. A superb book that is intelligent, realistic and grounded in a profound faith in the truths about human persons and human sexuality set forth in divine revelation.