It is 2056, and your granddaughter and grandson-in-law have decided to make a baby. He cooks a romantic dinner, she puts on some Barry White, one thing leads to another. Or, specifically, she takes a skin sample, he takes a sperm sample, and they send both to a laboratory, where 100 embryos will be made and a few weeks later they will get to choose the best.

A Stanford academic believes we are on the cusp of one of the most momentous changes in the history of evolution. All humans currently alive have one thing in common. Going back in an unbroken chain for millions of years our ancestors, whether they were modern humans, Homo habilis, or a fish that just learnt to walk, had sex, and in doing so made a new generation.

Not for much longer. Soon, Henry Greely argues in his book The End of Sex and the Future of Human Reproduction, that will not necessarily be the case. “In 20 to 40 years, when a couple wants a baby, he’ll provide sperm and she’ll provide a punch of skin,” says Greely, a professor of law and genetics. Stem cells will be made from the skin, they will be made into eggs, the eggs will be fertilized and, “The prospective parents will be told, ‘These five have really serious diseases, you don’t want them’. Of the other 95, they will be given the pluses and minuses.” The winning embryo will then be implanted in the woman.

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The two big advances that Professor Greely believes will democratize this process for all will be better knowledge of the genome, and an ability to make eggs from skin cells – ensuring that the onerous egg-harvesting process of IVF is a thing of the past. Both of these developments are anticipated in the near future. “Parents will get the embryos grouped by categories. One category will be very severe, untreatable, nasty diseases. This will affect 1-2 per cent of embryos. Another category will be other diseases. The third is cosmetics: hair, eyes, shape, whether the hair goes white early. We don’t know much about this yet, but we will. A fourth category is behavioral – I think here information will be limited. We won’t be able to say, ‘This child is in the top 1 per cent of intelligence’. We probably will be able to say, ‘This child has a 60 per cent chance of being in the top half’.”