London: Men have a better chance of having kids if they have semen teeming with strong-swimmers, but fertility experts now claim that sperm which had tails of a similar length were better able to travel than those with tails of varying lengths.The team led by James Mossmon were surprised to find that tail consistency trumped average length, the Daily Mail reported.The findings add to our understanding of why some couples struggle to have children.Around one in six couples may have difficulty conceiving in the UK - which is around 3.5million people.Couples are recommended to visit their GP if they have not conceived after one year of trying, or sooner if the woman is aged over 35.
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