We can afford to be sarcastic now, but scientists are working on ‘rectifying’ the situation. I believe that those attempting to modify female cells to be able to fertilize eggs has already had some success in developing mice with female ‘fathers’. Similar ‘developments’ to combine sperm cells to ‘make’ a child, and to have extra-uterine fetal growth to a full-term child, are apparently not as far along, but no longer completely in the realm of SF writers either.

As for ‘natural law ‘, for many people, invoking it seems to be as backward and obscurantist as someone in 1900 saying ‘ Those flight experiments are silly. If God had wanted us to fly, He would have given us wings. ‘ – or, even more to the point, like those Protestant preachers in the 1800′s who condemned the use of anesthetics for women in labor because it was countermanding God’s statement than women would ‘bring forth children in pain.’ For some folks, saying something is unnatural to them brings no reaction but a shrug.