This argument is wholly unsuited to the modern age. Society freely allows single people to reproduce sexually, whether by accident or design. Existing lawful practices such as sperm donation allow deliberate procreation without knowledge of the identity of the father. Surely it is preferable for a mother to know the genetic heritage of her offspring, rather than accept sperm from an unknown and random donor? Moreover, reproductive cloning will allow lesbian couples to have children genetically related to them both. It might be better for the welfare of the child for it to be born into a happy relationship, but the high rates of single parenthood and divorce suggest that this is not always possible.