LifeCycle Events: Marriage and Sexuality: Wasting Seed:
Where does the Torah forbid "wasting seed"?
The source for the prohibition of wasting seed is Talmud Niddah
13b, where it is derived from the sixth Commandment (Lo Tin'af);
see Rif Shabbos Ch.14 (p.78 in the standard editions) and Rashi
on it. The subject is treated in Maimonides' code in Issurei
Biah 21:18, and in Shulchan Aruch Even ha-Ezer 23:1. See also
Talmud Yevamos 34b, particularly on the sin of Er snd Onan
(Gen. 38:7-10).
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