This paper defends the permissibility of stem cell research against a theological objector who objects to it by appealing to "souls.".

Opponents of destructive embryo research, such as embryo rightists, as well as proponents accept that natural reproduction is permissible. There is an alternative to natural reproduction—to remain childless. John Harris began this series of articles by asking, what does a commitment to the permissibility of natural reproduction entail? Harris has argued that a commitment to the permissibility of natural reproduction entails a commitment to the permissibility of destructive embryo research. Julian Savulescu has denied this. However, there are significant areas in (...) which our views have converged. (shrink)

John Harris gives a comprehensive and generally valid defense of embryo research. Although nearly all his arguments are valid, one—the argument comparing natural reproduction to embryo research—is problematic in several important ways. I focus here on that argument.

Sex is not the answer to everything, though young men think it is, but it may be the answer to the intractable debate over the ethics of human embryonic stem cell research. In this paper, I advance one ethical principle that, as yet, has not received the attention its platitudinous character would seem to merit. If found acceptable, this principle would permit the beneficial use of any embryonic or fetal tissue that would, by default, be lost or destroyed. More important, (...) I make two appeals to consistency, or to parity of reasoning, that I believe show that no one who either has used or intends to use sexual reproduction as their means of procreation, nor indeed anyone who has unprotected heterosexual intercourse, nor anyone who finds in vitro fertilization acceptable, nor anyone who believes that abortion is ever permissible can consistently object on principle to human embryo research nor to the use of embryonic stem cells for research or therapy. (shrink)

This essay deals with the question of the morality of abortion and infanticide. The fundamental ethical objection traditionally advanced against these practices rests on the contention that human fetuses and infants have a right to life, and it is this claim that is the primary focus of attention here. Consequently, the basic question to be discussed is what properties a thing must possess in order to have a serious right to life. The approach involves defending, then, a basic principle specifying (...) a condition living things must satisfy to have a serious right to life, and the answer given makes it unlikely that this condition is satisfied by human fetuses and infants, though this tentative conclusion could be altered by future scientific studies of the development of the human brain. As things stand at the moment, however, it seems unlikely that developing humans acquire the physical basis of the psychological capacities on which the right to continued existence rests, and therefore unless there are other substantial objections to abortion and infanticide that undercut the above line of thought, the conclusion is that such practices are not intrinsically wrong. (shrink)