So is polygamy ok again?
trust me, you don't want more than one wife. I've had three and if I had had just two of them at the same time, I would be dead... series!
I doubt you could cite a single instance in the Bible where a polygamous marriage was happy. This is one of those instances where Biblical narrative works against Bilical law, openning the way to to Judaism's finally banning polygamy in the middle ages, and, in fact, a restoration of Genesis 2:24...
"Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh."
Note the singular emphasis. One flesh.
Monogamy was introduced by the Church.