The cervical fluids produced by the woman is a perfect environment to allow the sperm to swim up north to the cerci and then to the uterus.
Most sperm die in the vagina in the first day.
However, under healthy conditions and proper placement the sperm can last anywhere from 3-5 days.
You need to calculate this time in when checking ovulation dates.
Having intercourse when a woman is fertile increases the pregnancy possibility.
However, having intercourse 3-5 days before your fertile period can also result in pregnancy.
I hope I explained this well enough.
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