 There are obvious problems of implementing requirements of justice with respect to (opportunities for) personal relationship goods that have to do with both the feasibility and the desirability of various implementation methods. It seems important to draw a distinction between how feasible it is to enforce duties corresponding to the right to enjoy personal relationship goods, and how desirable it is to enforce the duties in particular circumstances. Some (Cowden 2012b) run the two considerations together, while others (Brownlee 2013) distinguish them.