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He found that the women were asked to perform the largest number of dances, and therefore got the most money, during their most fertile days and so were most attractive to men then. What one fertility expert calls "gourmet sex" - where both partners take time to ensure the other has a satisfying experience - gives a couple the best chance of producing a baby. An extra five minutes of sexual activity before ejaculation can produce an extra 25 million sperm, said Pacey. Men usually produce about million sperm during intercourse. The research tallies with previous studies showing men who have viewed pornography just before ejaculation also produce greater amounts of sperm. The programme, a dramatisation of the epic journey sperm undertake in their quest to fertilise the egg, reveals other fertility secrets.

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'Wild, energetic sex is key to conception'

That's the wrong thing to be doing," said Dr Allan Pacey, a senior lecturer in andrology at Sheffield University. The findings were so striking that Danish pig farmers are given a government-approved five-point plan showing them what to do. That, plus the fact the extra sperm released are of a higher standard, means there is a greater chance of the sperm and egg fusing to create a new life. He found that the women were asked to perform the largest number of dances, and therefore got the most money, during their most fertile days and so were most attractive to men then.

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