"It was the law among the Jews that the widow of a man who died without children should be married to the brother of the deceased, and that any offspring resulting from this union should be attributed to the deceased husband: this is the law known as leviarate marriage (Deuteronomy, 25, 5-10), which was intended to prevent families from dying out. Here, Onan, in order not to lose his brother's inheritance, prevents procreation with a sin that he calls onanism, which corresponds precisely to modern Malthusianism. The Bible's condemnation of these practices is inexorable."