Thematic Bible: Why moses allowed divorce

Then they asked Him, "Why did Moses command us to give a written divorce charge, and in this way to divorce a wife?" He answered them, "It was because of your moral perversity that Moses allowed you to divorce your wives, but it was not so from the beginning.

Some Pharisees came up, and to test Him they began to ask Him whether a man should be allowed to divorce his wife. And He answered them by asking, "What has Moses commanded you about it?" They answered, "Moses allowed a man to divorce his wife, if he wrote out a divorce charge." read more.
But Jesus said to them, "It was due to your moral perversity that Moses wrote that command in your law. But from the beginning of the creation, 'God made them male and female.