According The Advertiser, an Australian publication, University College Hospital in London has applied to use IVF sex selection techniques to help couples with a family history of autism by destroying all their male embryos. Here's how it would work:

Professor Joy Delhanty of UCH said her team would create embryos using IVF and test them at a few days old to see if they were boys or girls. Only girls would be implanted into the mother. .. Normally we would not consider this unless there were at least two boys affected in the immediate family."

Hardly a foolproof method at best... and ethically... startling!