Although homosexuality was not considered a major offense during the early Roman Empire, homosexual encounters and homosexual behavior came to be viewed as unacceptable as Christianity developed. The
Hebrew Bible (Leviticus 18:22, 20:13, Deuteronomy 22:5) condemned females who wore male attire, males who wore female attire, and males that engaged in homosexual intercourse. In the 11th century the
Benedictine monk and
cardinal Peter Damian wrote the
Liber Gomorrhianus, an extended attack on both homosexuality and masturbation. He portrayed homosexuality as a counter-rational force undermining morality, religion, and society itself, and in need of strong suppression lest it spread even and especially among clergy.
Hildegard of Bingen, born seven years after the death of St. Peter Damian, reported seeing visions and recorded them in
Scivias (short for
Scito vias Domini, "Know the Ways of the Lord"). In Book II Vision Six, she quotes God as condemning same-sex intercourse, including
lesbianism; "a woman who takes up devilish ways and plays a male role in coupling with another woman is most vile in My sight, and so is she who subjects herself to such a one in this evil deed". In the 13th century, the theologian
Thomas Aquinas was influential in linking condemnations of homosexuality with the idea of
natural law, arguing that "special sins are against nature, as, for instance, those that run counter to the intercourse of male and female natural to animals, and so are peculiarly qualified as unnatural vices." This view points from the natural to the Divine, because (following
Aristotle) he said all people seek happiness; but according to Aquinas, happiness can only finally be attained through the
beatific vision. Therefore, all sins are also against the natural law. However, the natural law of many aspects of life is knowable apart from special
revelation by examining the forms and purposes of those aspects. It is in this sense that Aquinas considered homosexuality unnatural since it involves a kind of partner other than the kind to which the purpose of sexuality points. Indeed, he considered it second only to bestiality as an abuse of sexuality. ==Early Christian medieval views==