Human beings reflect the dual aspects of Divinity as a pair, not as multiple bondings. Polygyny and polyandry are not the ideal form of conjugal relationship. They have functioned as responses to particular circumstances, even sanctioned by God in order to advance His providence of restoration to the ideal. However, true happiness for all human beings, and stable, harmonious societies are not achieved through polygamous relationships.
The second Blessing God gave His children is that of conjugal love, which results in the expansion of love, life, and lineage. When multiple men partner with a single woman, the true love of God cannot be manifested in their relationship and families, and the lineage becomes confused.