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SHOULD people be allowed to choose the sex of their babies? Attitudes in the US and the UK could hardly be more different. After a thorough review, which included consultation with the public, the UK’s Human Fertilisation and Embryology Authority last year decided against any form of sex selection done purely for social reasons. Clinics offering techniques that sort sperm to increase the chances of having a boy or a girl, or a newer method called PGD in which embryos are sexed prior to implantation, can only perform these services if there is a medical reason to justify the treatment …