I just can't make my gut happy with that. Greatest-good-of-the-greatest-number-wise it seems to make sense, but...no.

It doesn't make sense to me in Utilitarian terms either, primarily because of the fear it will cause among the general population that they or someone they love will be singled out to provide tissue for others. Also because the survival rates for people with organ transplants aren't great and because it would be unecessary if we simply moved to an opt-out system for organ donation rather than the current opt-in one.

I don't think there's any clear cut Utilitarian answer to what the legal status of abortion should be (other than really obvious things like 'it should be legal if the mother's life is at risk').