Jacob, David and various other Biblical figures had more than one wife at the same time and some had many concubines as well.
If Biblical precedent doesn't work for you than the code of moral law you abide by is yours alone so why subject everyone else to it.
In America a man can impregnate 5 willing women and if he is rich enough, be forced to provide financially for each of his children, as he should. If those 5 women all decided they wanted to live in the same house with the man and all care for the children of the same father, the law is against it.
It seems to me homosexuals want the government to recognize gay marriage to not only be accepted as normal behavior but also to reap government benefits like tax breaks for the married.
Read post #59, plus consider the following:
Jacob:
We know that...
Labanite deception, and not God, was the author of Jacob's original polygamous wife. [Jacob had been told by his monogamous father, Isaac, to explicitly take "a wife" (not wives plural) in Gen. 28:2.]
...nothing but one big pregnancy rivalry and poor emotions reigned in Jacob's household (see Genesis 30).
...the two wives' servants were brought into the equation to simply fuel that baby competition, and that one of the servants was only referenced as a servant/concubine.
...the other servant/concubine, Bilhah, later slept with one of Jacob's adult sons, Reuben...hardly what would be done even in those times--to sleep with somebody who might be deemed a "stepmom."
David:
In David's era, wives and concubines were accumulated in royal households, often as part of peace pacts with other tribes. David simply inherited Saul's wives or concubines (not sure which is was) from Saul as part of the kingdom transfer. Beyond that, the OT mentions Michal's death (David's first wife), so that may have preceded Bathsheba's relationship. And the references to "wives" in 2 Sam. 12:8--we know they were concubines who were not sexually loyal to David by comparing 2 Sam. 14:21-22 to 2 Sam. 12:11. The Hebrew word for "wives" in 2 Sam. 12:8--ishshah--was used even more commonly as the basic word for woman and is even used for female animal mates boarding the ark in Genesis 7. (I don't think we would call them "wives").