The Bible first states that God created man and woman on the sixth day and the rabbis felt that this meant that God created the sexes simultaneously. After all it specifically says that on the sixth day, God created all the beasts and man and woman.
“…Male and female he created them. And God blessed them, and God said to them, “Be fruitful and multiply, and fill the earth and subdue it…”
Yet, The Bible goes on to say that man was alone in his tending of the Earth and its creatures, so God made him a companion.
“…But for the man there was not found a helper fit for him. So the Lord God caused a deep sleep to fall upon the man, and while he slept took one of his ribs and closed up its place with flesh; and the rib which the Lord God had taken from the man he made into a woman and brought her to the man. Then the man said, “This at last is bone of my bones and flesh of my flesh; she shall be called Woman…”
This would imply that God made man on the sixth day and then some time later created woman. The rabbis found themselves confronting a severe and puzzling contradiction in the Holy texts and thus concluded that Eve, who was made from Adam’s rib, was not the first woman. The rabbis poured over various pagan legends and apocrypha from the nearby ancient cultures and were startled to uncover the accounts of Lilith. In Sumer and Babylon there were myths of Lilitu, or more commonly Lilith, who was declared to be Adam’s first wife and the true first woman.
According to apocryphal lore, Lilith was strong willed and fiercely independent and when the time came for Adam and Lilith to consummate their marriage in the sexual act, Lilith rebelled. Adam insisted that since he was a man and she a woman, that he should mount her from the top. Lilith refused, claiming that God had made them both as equals, and that to lay upon her back on the bare Earth was an insult since all lesser beings are of the Earth while God and his angels were of Heaven and divine. ...