God created man and named him Adam. Adam lived in the Garden of Eden for quite some time and then one day God came to him.
God said "Adam, I see you here everyday walking around in the garden, but I have come to think that you might be lonely. So I am going to create another creature with which you can interact with. She will be called Eve. She will be everything you hope for and the most beautiful creature you have ever seen. More wonderful than any of my creations. She will tend to your every need, care for you, feed you, comfort you. She will do your bidding as you ask and respect your wishes through and through. She will do all this and ask of nothing in return. But as I see fit, I will require something from you in return."
Adam after hearing all this was delighted and said "What do you ask of me Lord?"
"It will cost you an arm, your left foot, a rib, your right collar-bone and your left testicle"
After a long pause contemplating this arrangement, Adam replied "What can I get for a rib?"