Because some countries, like China, still prefer having boys over girls because they are "worth" more to the family. Dr Sandra Hacker, Chair of the Australian Health Ethics Committee, says: "...The main reason the public is against gender selection right now is that a human being's existence should not be based on their gender ". Bob Phelps, director of Gene Ethics, says; “Gender is an opportunity you take when you have children. You shouldn't choose it for lifestyle