What part does the Bible play in deciding the morality of same-sex acts?
Unlike some other Christian churches, the Catholic Church does not rest its teaching on the Bible alone. But the Catholic Church does appeal to the Bible to support its teaching about natural law. Church documents have claimed that, from the book of Genesis to the end of the Christian Testament, there is constant opposition to homogenital acts.
However, contemporary Bible scholars raise many questions about the matter. Read within the context of their own historical and cultural backgrounds, the Bible texts do not address adult, loving homosexual relations as we understand them today.
Taken from Daniel A. Helminiak, FAQs: Catholicism, Homosexuality, and Dignity, written for DignityUSA, 1996, 2000.