A woman’s root is from the Left column, that is judgment. A man’s root is from the right column, that is mercy. During the unification the man contributes the ‘white’ and the woman contributes the red. The white in the child is the skeleton and the red is the flesh and blood.
The white is very important for the woman because it sweetens the judgment that is the foundation of her vessel.
Woman goes through monthly cycles and releases the judgments, ‘red’ with pain. When she receives into her vessel the ‘white’ of the man, she receives from the right column and it creates balance in her. If the white turns to a process of procreation, the aspect of judgment disappears from her vessel and she produces white.
It’s beneficial for man and woman to have proper and pure unifications in order to bring balance and blessings into their lives.
The Zohar talks about man and woman but we should study it as Light and vessel. Every desire we have is a vessel and it comes with the aspect of judgment. We need to draw pure Light into it in order to have fulfillment from the Light and not from the judgment of the other side.