Adam was hanging around the Garden of Eden feeling very lonely.
So, God asked him, "What's wrong with you?"
Adam said "I'm lonely and don't have anyone to talk to."
God replied, "I will make you a companion and that it will be a woman. This pretty lady will gather food for you, she will cook for you, and when you discover clothing, she will wash it for you. She will always agree with every decision you make and she will not nag you. And will always be the first to admit she was wrong when you've had a disagreement. She will praise you! She will bear your children, and never ask you to get up in the middle of the night to take care of them.
Adam asked God, "What will a woman like this cost?"
God replied, "An arm and a leg."
Then Adam asked, "What can I get for a rib?"