Trying to start a family isn't always easy. As many as one in six couples have fertility problems and the rates are rising. Out of every couples trying for a baby, 80 to 90 will get pregnant within one year, according to the NHS website. The rest will take longer, or may need help to conceive.
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Getting to grips with the numbers behind the man's part of the reproductive system. Although I'm a biologist, I rarely think much about what the cloudy white stuff contains, but in fact semen is far more complex than my endearing childhood image of mini tadpoles swimming around in thin wallpaper paste. There are many features of human semen that are very familiar to most people, but their importance isn't appreciated. For a start, the ejaculate isn't of a uniform consistency. As the man ejaculates, the first 'spurt' contains far more sperm than subsequent spurts.
Sperm is a reproductive cell found in semen, a fluid that males produce and release during sexual relations. Sperm cells play a vital role in pregnancy. Some men experience infertility because of a low sperm count.