Onan must have been a malicious and incorrigible scoundrel. This is a most disgraceful sin. It is far more atrocious than incest and adultery. We call it unchastity, yes, a Sodomitic sin. For Onan goes in to her; that is, he lies with her and copulates, and when it comes to the point of insemination, spills the semen, lest the woman conceive. Surely at such a time the order of nature established by God in procreation should be followed . . . He was inflamed with the basest spite and hatred . . . Consequently, he deserved to be killed by God. He committed an evil deed. Therefore God punished him . . . That worthless fellow . . . preferred polluting himself with a most disgraceful sin to raising up offspring for his brother. (Lectures on Genesis: Chapters 38-44; 1544; LW, 7, 20-21) Luther, Martin, Luther’s Works (LW), American edition, edited by Jaroslav Pelikan (volumes 1-30) and Helmut T. Lehmann (volumes 31-55), St. Louis: Concordia Pub. House (volumes 1-30); Philadelphia: Fortress Press (volumes 31-55), 1955.