Some medieval Christians conceded the Qur’an forbids sodomy

Evidence

William of Auvergne, and Benedict of Alignan following him, understood the opposite of the usual idea: sodomiticam spurcitiam interdizxit, they said. William recognised the failure of the prohibition in practice, in spite of the multitude of wives who, he thought, might be expected to extinguish homosexual desires; but he accounted for this, realistically enough, as springing from irresistible desire, rather than from the encouragement or toleration of religion. — Norman Daniel, Islam and the West, 795