Adam was in the Garden of Eden before Eve came along. One day while he was walking around, skulking a bit, God asked him what was wrong. Adam replied, "I am alone here, all the other beasts and fowl have a mate, but I do not."
So God thought for a moment, then answered that he would create a woman for Adam.
Adam, quite curious, responded, "What is this 'woman'?"
God answered again, "She will be the most beautiful creature, she will love you for all that you are, never bother you about how you take care of yourself or how you run the Garden. She will respect you for all the work you do, she will never ask a loaded question. She will never hold you responsible for things out side of your control. She will know exactly how you think and will comfort you whenever you are in need. She will be everything to you, and you will be everything to her."
Adam, excited at this prospect, "When may I have her?"
God smiled and said, "She will cost you Adam. For me to make her for you, you will need to give up one hand, one leg, one eye, one ear, one kidney, one lung, half your teeth, and half of what makes you a man."
Adam thought for a moment, "What can I get for a rib?"