  While there are many different variants under this heading, the basic claim common to all is that autonomous and competent adults have a strong presumptive right to do as they please with their own bodies (especially where this is not substantially harmful to third parties). Therefore, at least in the absence of strong reasons to do otherwise, people should be allowed to sell parts of their bodies if they so wish. Whether there are any such strong reasons is of course a moot point and the main candidate reasons are discussed in subsequent sections.