According to the great sage Maimonides, “A man’s wife is permitted to him and therefore, whatever he and his wife wish to pursue sexually, they may do. They may have intercourse whenever it pleases them and he may kiss any organ he wishes, and he may have intercourse in a natural and unnatural manner.

While it is true that the willful “wasting of seed” is prohibited in Judaism, this applies in cases where a man goes out of his way to avoid insemination, known as coitus interruptus or the pulling out method.  In those cases, withdrawal actually lessens pleasure and is done only to prevent pregnancy.

But in oral sex, the motive is not to destroy seed. Rather, it’s for a couple  to experience pleasure and focus fully on one another, increasing their passion, attachment and sexual dependency on each other.

So, while Judaism does not permit sexual practices that involve intentionally “destroying” seed, it does allow acts that may include the “spilling” of seed, when pursued for the purpose of enhancing and exciting a couples sex life.