Aren’t you aware of the fact that when anyone sleeps with a prostitute he becomes a part of her, and she becomes a part of him? For it has been declared: The two become a single body.
When Judah saw her, she was wearing a veil over her face, so he thought she was a prostitute. He had no clue that she was his own daughter-in-law. So he approached her and said, “Come sleep with me.” “What will you give me if I do?” she answered.
About three months later, Judah was told, “Your daughter-in-law Tamar has been promiscuous, and now she is pregnant!” Indignant, Judah said, “Bring her out, and let her be burned!”