This book is the absolute best on the market relating to the Catholic Church and her teachings on sex and sexuality. I have read Humane Vitae and love the document, which is prophetic. I have read Chris West's work (he is the man who introduced me to the Church's teaching) and have since read his critics, both liberal and conservative, including those who reject Theology of the Body itself as a liberal distortion. (I attend the Latin Mass, and there are a fair number of providentialists in the movement who feel that the Pope John Paul II's work abandoned the concept of "grave reason" in the Church's tradition. They say that NFP is a concept that should be rejected unless one could die in childbirth etc. etc.)After tons of reading, I came across this volume. I am not a psychologist, I am a teacher with interests in music, theology, and history. As such I have recognized that while many people write and argue about the nuances of Catholic teaching vis a vis the immorality of contraception, very few write complete books that address not just the moral theology, but also the psychological ramifications of implementing the teaching in our lives.This book has the best and most complete introductory section on the Church's teaching I have ever read. But more than that, this book addresses the common problems married couples will encounter when giving their lives to this teaching. While those who practice NFP enjoy a divorce rate of around 5% (FAR lower than the general population) that does NOT mean that practicing NFP is without its risks. As a practicing family therapist, Dr. Popcak has seen it all. He addresses these topics with charity and love that enable couples to see that they are not alone in struggling to implement this teaching. When we "sell" this teaching in pre-cana far to often the couples who do the teaching are very passionate and want to convince. Therefore they undersell the potential difficulties that couples will deal with in implementing the teaching. Therefore, couple who throw away their contraceptives may feel that something is "wrong" with them if they encounter problems. This book is the absolute best at handling this very difficult situation.The section on sex itself is absolutely steamy. This honesty from the likes of Popcak and West has lead to some criticizing their work as overly romantic. A look at the generational differences quickly shows that these critics are usually much older and of a generation that grew up in a VERY different environment regarding sex and sexuality than Generation X and younger Catholics did. This book (and West's work) meet the young couples where they are. That is important. You do not have to give up your excellent sex life to be a good Catholic. A good sex life is psychologically healthy (so long as you are married and having sex with just your spouse, and are not using artificial contraception, and only abstain for purposes of preventing a pregnancy for serious reason).I strongly recommend this book. It is the most friendly, most clearly written, and most complete introduction to the topic. A must read for every young Catholic couple, and every Catholic couple contemplating marriage.