Onanism

onanism \ˈō-nə-ˌni-zəm\ noun: 1. masturbation, 2. coitus interruptus, 3. self-gratification

Etymology: probably from New Latin onanismus, from Onan, son of Judah (Genesis 38:9)

Ancient Hebrew law required a man to marry his deceased brother's widow. In the case of Onan, he didn’t want to bear children with his brother Er’s widow Tamar, so he spilled his seed at the decisive moment. God didn’t like that, so He killed Onan. Yikes.