Gender Selection

People should have a right to choose the gender of their child but the costs should be based on the degree of deviation from the natural population birth ratio due to the use of gender selection methods throughout the population (the higher the deviation from normal the higher the fee would be to select that gender which is favored).

Genetic Modification

The genetic modification of human embryos for purposes of eliminating or reducing negative health  characteristics should be allowed.

Perhaps the modification of other traits which are not particularly relevant for health should be allowed but should also be heavily taxed to reduce the frequency of these options from occurring. Such a tax would not only reduce the speed at which such practices are adopted throughout society and allow for any long-term negative consequences to become visible before wider adoption occurs, but such a tax for something that is clearly a luxury would also be an element that helps make the tax code progressive.