Sperm inside the vagina

There are approximately million sperm in each human ejaculation, but only about 2 million sperm make it into the cervix. Out of the approximately 2 million sperm entering the cervix, only about 1 million make it into the uterus. The rest are stopped by gooey mucus, or swim into dead-end channels inside the walls of the cervix. Out of the approximately 1 million sperm that enter the uterus, only about 10, make it to the top of the organ. The rest are attacked and absorbed by white blood cells, which start to appear in force as soon as sperm enter their defensive perimeter. Out of the approximately 10, sperm cells that make it to the far end of the uterus, only about 5, turn in the right direction.
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Why does sperm leak after intercourse?

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Can You Get Pregnant if You Have Sex Standing Up? (for Teens) - KidsHealth

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How long does sperm live after ejaculation?

A lot of numbers are thrown out there about the lifespan of sperm but here's the scoop: sperm can live as little as a couple of hours or as long as five days after sex. Once inside the vagina, the lifespan of the sperm depends on the woman's vagina, uterus, and fallopian tubes. Without fertile cervical fluid, sperm won't survive longer than a few hours inside the vagina or uterus if they make it that far. Many sperm die off in the very acidic vaginal canal within the first 12 hours. If they can make it past the uterus into the fallopian tubes using fertile cervical fluid channels, they can live there, waiting for the release of an egg.
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Back to Pregnancy. Yes, although the risk of getting pregnant in this way is very low. If you want to avoid getting pregnant, you should use contraception. A man's semen the liquid produced when he ejaculates or "comes" contains millions of sperm. One ejaculation can contain more than million sperm.
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