Leviticus 18:23

18:23 You must not have sexual intercourse with any animal to become defiled with it, and a woman must not stand before an animal to have sexual intercourse with it; it is a perversion.

Leviticus 20:12

20:12 If a man has sexual intercourse with his daughter-in-law, both of them must be put to death. They have committed perversion; their blood guilt is on themselves.