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In February 2023 I found myself sitting in the waiting room of a San Francisco fertility clinic, holding a cup of my own semen.

The Bible tells the story of Onan, son of Judah. Onan’s brother died. Tradition dictated that Onan should impregnate his brother’s wife, ensuring that his brother’s line would (in some sense) live on. Onan refused, instead “spilling the seed on the ground”. God smote Onan, starting a 4,000-year-old tradition of religious people getting angry about wasting sperm on anything other than procreative sex.

Modern academics have a perfectly reasonable explanation for all of this. If Onan had impregnated his brother’s wife, the resulting child would have been the heir to the family fortune. Onan refused so he could keep the fortune for himself and his descendants. So the sin of Onan was greed, not masturbation. All that stuff in the Talmud about how the hands of masturbators should be cut off, or how masturbation helped cause Noah’s Flood (really! Sanhedrin 108b!) is just a coincidence. God hates greed, just like us.

Modern academics are great, but trusting them feels somehow too convenient. So there in the waiting room, I tried to put myself in the mindset of the rabbis thousands of years ago who thought wasting semen was a such a dire offense.

https://www.astralcodexten.com/p/in-the-long-run-were-all-dad