If semen gets in the vagina, the sperm cells can swim up through the cervix and uterus and into the fallopian tubes, looking for an egg. They have up to 6 days to find an egg before they die. When a sperm cell joins with an egg, it's called fertilization. Fertilization doesn't happen right away.
The sperm does enter the body of a female and start to swim towards her ovaries and basically its a see who can be strong and make it test and the last sperm cell gets the privilege to fertile the eggs
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I think this a more honest and informational answer now :)
