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Sperm survival outside

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This small amount of semen contains millions of sperm cells. It only takes one sperm to fertilize an egg, but each sperm has a limited life span, which begins once it leaves a man's body. For a couple trying to have a baby, it is important to know how long the sperm can survive. Having sexual intercourse around the time of a woman's ovulation will increase the chances of pregnancy. However, when sperm is outside of the body, it cannot survive for long.
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How long does sperm live inside a woman – what affects the survival of sperm.

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How long does sperm live inside a woman – what affects the survival of sperm.

Here, Mike - writing with Hilary McQueen - gets to grips with the numbers behind the man's part of the reproductive system. Please be aware that the information provided on this page may be out of date, or otherwise inaccurate due to the passage of time. For more detail, see our Archive and Deletion Policy. 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.
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I was just wondering if you could tell me how long semen can survive outside of the human body. My girlfriend is worried as some semen got on her hand and about 10 minutes later she touched her vagina. There was no intercourse and no genital contact. She missed her Pill so we were playing it safe.
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