“For the moon is concealed, since then this evil serpent rules, liable to harm the world. But when compassion arouses, the moon ascends, removing herself, so he is confounded, unable to rule—removed so he cannot approach. So on Rosh Hashanah one must confound him, like someone roused from sleep, totally unaware. On Yom Kippur one must pacify and appease him with that goat offered to him, and then he turns into an advocate for Israel;” (p. 236-237)
Rabbi Chizkiyah then asked: How could they have begotten offspring there (in Gan Eden)? Had the Evil Inclination not been drawn down on him and he sinned, he would have dwelled alone in the world and would have not begotten any offspring! The same applies to Yisrael; had they not sinned by the golden calf and drawn upon themselves the Evil Inclination they also would have never borne any offspring, and no new generations would have come into the world. The main point is that the power of mating derives mainly from the Evil Inclination. So without the Evil Inclination there can be no offspring.
FULL ARTICLE SOURCE
ZOHAR 2:33A SOURCE
ZOHAR 1:61A SOURCE