Even though God allowed it in the Old Testament, I believe even in His eyes marriage is really supposed to be something between one man and one woman. When Abraham took Hagar as a wife and she bore Ishmael, we could see the jealousy and resentment that came about from Sarah, and it was at her urging that Abraham go in to Hagar to begin with. Similarly we saw this competition and some harsh feelings between the sisters Leah and Rachel to see who could give Jacob more sons or children, even bring their own handmaids into it as well.
I recall a story that I’ll never forget in which some African businessman was actually “sexed to death”. He had multiple wives, and favored the youngest and the prettiest. The other wives got jealous and demanded that he have sex with them, one by one. They forced themselves on him and literally killed him.
One man, one woman. I truly believe that has always been God’s ideal design. No gay marriage. No polygamy as a general rule.
Besides that, I say this as a single guy. But I always hear that one wife is torture enough. =P
One wife is torture.... Not if you’re evenly yoked.
Hagar was taken because of doubt that Sarah could conceive. It was sin. With Jacob, he was tricked into marrying the oldest daughter first. That was sin. Then the giving of the handmaids was about competition and jealousy. Also sin. The polygamy in the OT was not God’s design. It does not seem that heterosexual polygamy was as offensive as homosexuality. It was not God’s design, but it did not bring the wrath that the other brought.