Genesis 15:3

15:3 Abram added, “Since you have not given me a descendant, then look, one born in my house will be my heir!”

Genesis 19:32

19:32 Come, let’s make our father drunk with wine so we can have sexual relations with him and preserve our family line through our father.”

Genesis 38:8

38:8 Then Judah said to Onan, “Have sexual relations with your brother’s wife and fulfill the duty of a brother-in-law to her so that you may raise up a descendant for your brother.”