The present work mainly uses reason and Holy Scripture in order to explicate Catholic moral theology, in the areas of sexuality, gender, and the family. Far from being a merely "moralistic" or "puritanical" or "Victorian" sort of outlook (often perceived by many as a set of unnecessary, stifling, negative rules), Catholic moral theology is based on what God has revealed to us in His inspired Word, the Bible, and is a positive teaching about who man is, and what fulfills him, in accordance with God's purpose for His children, made in His image. It is my hope and prayer that this book will help Catholics to better understand the rationale behind their own Church's sometimes difficult-to-live-out beliefs concerning personal and institutional morality, and aid non-Catholics in finding common ground with Catholic moral teaching, and to better appreciate it, even where they find themselves in disagreement.