You must not have sexual relations with your daughter-in-law. She is your son’s wife; you are not to have sexual relations with her.

Not realizing that she was his daughter-in-law, he went over to her and said, “Come now, let me sleep with you.” “What will you give me for sleeping with you?” she inquired. ... “What pledge should I give you?” he asked. She answered, “Your seal and your cord, and the staff in your hand.” So he gave them to her and slept with her, and she became pregnant by him.

‘Cursed is he who sleeps with his mother-in-law.’ And let all the people say, ‘Amen!’

You must not lie carnally with any animal, thus defiling yourself with it; a woman must not stand before an animal to mate with it; that is a perversion.