Chapter — Clark, New Questions, Old AnswersChapter One: The Marital Debt and the Use of MarriageContentsMarital Debt?Natural Family Planning and Sexual ViceOther Errors DiscussedAn Analogy with Agriculture: NFP’s Causal StructureAn Analogy with Communication: NFP’s Pseudo-Frustration of a FacultyThe Doctrine of The Catechism of St. Thomas Aquinas