The point of Judith Jarvis Thomson's violinist example is to establish that one person, A, can acquire a right to use the body of another person, B, if and only if B performs some kind of affirmative act that gives A such a right. On her view, the reason it is permissible for you to unplug yourself from the violinist is that you did nothing to give the violinist a right to use your body: the violinist was plugged into you without your consent. Thus it follows that the mere fact that A needs use of B's body to survive is not enough to give rise to a right in A to use B's body. Accordingly, Thomson concludes, the claim that the fetus has a right to life does not imply abortion is morally impermissible.