The issue of homosexuality has a special significance today for Christian sexual ethics. For a variety of reasons discussed in the book, homosexuality is the issue which best measures the universal and evangelical character of any proposed sexual ethic that would claim the name Christian. At the same time, ethical proposals about homosexual acts and relationships must also meet the criteria established by the biblical and theological traditions, take into respectful account what is known about human sexuality from the human science, as well as pay heed to the teaching of the Church's magisterium. These are the challenges the present book attempts to face and to which it responds.