A SPERM AND OVUM SEPARATELY! CONTRA MARQUIS ON ABORTION AND CONTRACEPTION

Don Marquis argues that abortion is prima facie seriously wrong because it deprives the foetus of a valuable future. This paper argues that there is no morally relevant difference between the relations that foetuses stand in to valuable futures and those that gametes stand in to such futures. Therefore, Marquis' account implies that contraception is prima facie seriously wrong. My argument for this conclusion has a significant advantage over existing criticisms of Marquis based on controversial accounts of personal identity. It shows that the problem with his account is not his view that identity across time is a matter of merely biological relations, but his investment of those relations with moral significance. This criticism has force no matter which account of personal identity is true.