 Yet on what grounds might such an obligation be based? Some suggest that a moral basis for such an obligation may be found by focusing on the interests of and/or the rights of the children that will result from our procreative decisions (see Davis 2001 for a rights-focused approach). Arguments falling into this category thus focus on person-affecting reasons, picking out the harms or limits to opportunity associated with certain disabilities as providing good reason to select against donors with traits liable to result in such harms and limits to opportunity. Such an approach is intuitive. However, given the conclusions of the Non-Identity Problem (see the entry on  the non-identity problem),  many question the logic of appeals to the interests of the child created in all but cases of the most severe disabilities. For, as it is generally held that a life with a disease or disability is better than no life at all, and selection decisions alter who it is that comes to exist rather than the prospects of determinate future persons, a focus on the interests of future children cannot ground such an obligation (Bennett 2009; Parfit 1984; Parker 2007; Robertson 1994).