Petersen and Lippert-Rasmussen argue that persons who decide to be organ donors should receive a tax break, and then defend their view against eight possible objections. However, they misunderstand the Titmuss-style concerns that might be raised against their proposal. This does not mean that it should be rejected, but, instead, that when it is reconfigured to meet the Titmuss-style charges against it, they should support legalizing markets in human organs rather than merely offering tax breaks to encourage their donation.