There is a famous violinist who has a kidney problem. His only chance of survival is to be plugged into a person who shares his very rare blood group. You have that same blood group. One morning you wake up to find that while you were asleep doctors have attached him to your kidneys. Thomson argues that in such a situation you don't have a duty to keep him plugged into you, even though you know that he will die if you pull the tubes out. In the same way, she suggests, if a woman is pregnant even though she used contraception, the developing foetus inside her does not have an automatic right to
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