Onan was a figure detailed in the Book of Genesis chapter 38, as the second son of Judah and his Canaanite wife, the daughter of Shuah. Onan had an older brother Er and a younger brother, Shelah. Onan was commanded by his father, Judah, to perform his duty as a husband's brother according to the custom of levirate marriage with Er's widow Tamar. Onan refused to perform his duty as a levirate and instead "spilled his seed on the ground whenever he went in" because "the offspring would not be his", and was thus put to death by Yahweh. This act is detailed as retribution for being "displeasing in the sight of Lord". Onan's crime is often misinterpreted as being masturbation, but it is universally agreed among biblical scholars that Onan's death is attributed to his refusal to fulfill his obligation of levirate marriage with Tamar by committing coitus interruptus.
Biblical account After Yahweh slew Onan's oldest brother Er, Onan's father Judah told him to fulfill his duty as a brother-in-law by entering into a levirate marriage with his brother's widow Tamar to give her offspring. Religion professor Tikva Frymer-Kensky has pointed out the economic repercussions of a levirate marriage: any son born to Tamar would be deemed the heir of the deceased Er and could claim the firstborn's double share of an inheritance. However, if Er were childless or only had daughters, Onan would have inherited as the oldest surviving son. When Onan had sex with Tamar, he withdrew before he ejaculated and "spilled his seed on the ground" thus committing coitus interuptus, since any child born would not legally be considered his heir. The next statement in the Bible says that Onan displeased Yahweh, so the Lord slew him. Onan's crime is often misinterpreted to be masturbation but it is generally agreed among biblical scholars that Onan's death is attributed to his refusal to fulfill his obligation of levirate marriage with Tamar by committing coitus interruptus. The regulation of levirate marriage in Deut 25:7–10 shows that the custom had encountered some opposition:
But if the man has no desire to marry his brother’s widow, then his brother’s widow shall go up to the elders at the gate and say, ‘My husband’s brother refuses to perpetuate his brother’s name in Israel; he will not perform the duty of a husband’s brother to me.’ Then the elders of his town shall summon him and speak to him. If he persists, saying, ‘I have no desire to marry her,’ then his brother’s wife shall go up to him in the presence of the elders, pull his sandal off his foot, spit in his face, and declare, ‘This is what is done to the man who does not build up his brother’s house.’ Throughout Israel his family shall be known as ‘the house of him whose sandal was pulled off.’ Halizah, the ceremony above, allowing a man to refuse his duty was a concession to the reluctance to comply with the custom.
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Interpretation
Early Jewish views One opinion expressed in the Talmud argues that this was where the death penalty's imposition originated. The Talmud also likens emitting semen in vain to shedding blood. However, the regulations concerning ejaculation in the book of Leviticus, whether as a result of sexual intercourse or not, merely prescribe a ritual washing and becoming ritually impure until the following evening.
Classical Christian views Early Christian writers have sometimes focused on the spilling seed, and the sexual act being used for non-procreational purposes. This interpretation was held by several early Christian apologists. Jerome, for example, argued:
But I wonder why he the heretic Jovinianus set Judah and Tamar before us for an example, unless perchance even harlots give him pleasure; or Onan, who was slain because he begrudged his brother his seed. Does he imagine that we approve of any sexual intercourse except for the procreation of children? Epiphanius of Salamis wrote against heretics who used coitus interruptus, calling it the sin of Οnan:
They soil their bodies, minds and souls with unchastity. Some of them masquerade as monastics, and their woman companions as female monastics. And they are physically corrupted because they satisfy their appetite but, to put it politely, by the act of Onan the son of Judah. For as Onan coupled with Tamar and satisfied his appetite but did not complete the act by planting his seed for the God-given [purpose of] procreation and did himself harm instead, thus, as [he] did the vile thing, so these people have used their supposed [female monastics], committing this infamy. For purity is not their concern, but a hypocritical purity in name. Their concern is limited to ensuring that the woman the seeming [ascetic] has seduced does not get pregnant—either so as not to cause child-bearing, or to escape detection, since they want to be honored for their supposed celibacy. In any case, this is what they do, but others endeavor to get this same filthy satisfaction not with women but by other means, and pollute themselves with their own hands. They too imitate the son of Judah, soil the ground with their forbidden practices and drops of filthy fluid and rub their emissions into the earth with their feet Clement of Alexandria, while not making explicit reference to Onan, similarly reflects an early Christian view of the abhorrence of spilling seed:
Because of its divine institution for the propagation of man, the seed is not to be vainly ejaculated, nor is it to be damaged, nor is it to be wasted. To have coitus other than to procreate children is to do injury to nature.
Roman Catholic views
The papal encyclical Casti connubii (1930) invokes this Biblical text in support of the teaching of the Catholic Church against contracepted sex by quoting St. Augustine, "Intercourse even with one's legitimate wife is unlawful and wicked where the conception of the offspring is prevented. Onan, the son of Juda [sic], did this and the Lord killed him for it."
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