A fertility technique that allows parents to select the sex of their child could reduce the number of children they have overall, says the Rev. James Heft, S.M., chancellor and professor of faith and culture at the University of Dayton.
Some couples produce many children of the same gender while trying to produce one of the other.
If the couple wants only one boy and one girl, as many couples seem to do these days, then this method will probably appeal to them, particularly if they can afford it. It opens up the chances for a lot of mischief. Misused, this method transforms a part of life, a very intimate and sacred part, into something like going to the store and ordering what you want. One more commodification of what should not be commodified. The balance in number between the two has been pretty good when left to God.