Midrash Sekehl Tov, Genesis 19

“I pray you, brethren, do not so wickedly.” (Genesis 19:6). [Lot tells the Sodomites:] Do not do this thing [sexually abuse my guests] because it is wicked in the eyes of the Holy One, Blessed be He, as it says: “How can I do this great wickedness (and sin against God).” God likewise warns the sons of Noah, as it says, “and shall cling unto his wife and become one flesh,” and not with a man, for they cannot be made one flesh. [Translation by Rabbi Steven Greenberg]