This is a very good post @geeflow. We can see clearly in the Bible that problems arise if a man e.g Abraham has more than one wife:
Genesis 21: 9 "And Sarah saw the son of Hagar the Egyptian, whom she had borne to Abraham, scoffing. 10 Therefore she said to Abraham, “Cast out this bondwoman and her son; for the son of this bondwoman shall not be heir with my son, namely with Isaac.” 11 And the matter was very displeasing in Abraham’s sight because of his son."

Another example is King Solomon
1 Kings 11:1-4 "But King Solomon loved many foreign women, as well as the daughter of Pharaoh: women of the Moabites, Ammonites, Edomites, Sidonians, and Hittites— 2 from the nations of whom the Lord had said to the children of Israel, “You shall not intermarry with them, nor they with you. Surely they will turn away your hearts after their gods.” Solomon clung to these in love. 3 And he had seven hundred wives, princesses, and three hundred concubines; and his wives turned away his heart. 4 For it was so, when Solomon was old, that his wives turned his heart after other gods; and his heart was not loyal to the Lord his God, as was the heart of his father David."

And in the New Testament there is an instruction to have only one wife:
1 Corinthians 7:2 "Nevertheless, because of sexual immorality, let each man have his own wife, and let each woman have her own husband."

Thank you for this post, keep on steeming!