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But this also comes down to a really cool physical mechanism.
Crypts, or cervix glands, grow in number and increase in size to store more sperm.
Sperm gets ejected from the penis, enters the vagina, and swims up the reproductive tract until they reach the egg to fertilize it.
They may die even faster in a hot bath or a hot tub due to the heat or chemicals in the water.
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But if too many sperm reach the egg, two — or more, in rare cases — sperm can break through this layer and end up fertilizing the egg.
The body may compensate for extra testicle heat by releasing a little extra sperm-producing follicle-stimulating hormone.
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Without the addition of seminal fluid, which helps neutralize the vagina's acidity, sperm would have a much tougher time making it through.
It's the semen version of how when you're looking at a star, you're actually looking at light from years ago.
This is due to the protective effects of cervical mucus and cervical crypts.
A study of 1.