Adam was walking around the Garden of Eden feeling very lonely, and he heard a loud voice ask him, "What is wrong with you?" Adam said he didn't have anyone to talk to. Then the loud voice said he was going to give him a companion and it would be a woman.
He said "this person will cook for you and wash your clothes, she will always agree with every decision you make. She will bear your children and never ask you to get up in the middle of the night to take care of them. She will not nag you, and will always be the first to admit she was wrong when you've had a disagreement. She will never have a headache, and will freely give you love and compassion whenever needed."
Adam asked "What would a woman like this cost me??"
The answer was "an arm and a leg."
Adam then asked "What can I get for just a rib???"
The rest is history.