 The desire not to have a child with serious defects is not itself immoral, and actions to avoid such a reproductive outcome should be respected as an important aspect of procreative liberty. The question then is what means to achieve that goal are acceptable … Preconception selection by voluntary selection of mates or gametes raises the fewest problems … Concern with the genetic fitness of a mate may not be romantic but it is rational if one is concerned about the health of spouse and offspring. Mate selection should thus be left to the individual. Similarly, the selection of a gamete donor should be left to the couple that needs this service. (Roberson 1994: 154)