If sperm enters the body, most of them will die quickly in the acidic environment of their sister. Only under the buffer of a certain amount of semen, it is possible to prolong the survival time of a few sperm with strong vitality and get the opportunity to enter the uterus for fertilization. Generally speaking, the survival time of sperm in sister's body is: 2 hours after sexual intercourse, 90% died; For 36 hours, I couldn't even see the dead.

Therefore, fertilization should be done in a relatively large amount, and even if a small amount leaks in, it should be completed within 36 hours.

Sperm looks like tadpoles. It has a tail, and this "tail" helps it swim.

The concrete forms of progress can be subdivided into four types. About 90% of the sperm are moving in a normal way: these sperm are moving very fast (per second 140 micron, nearly 40 times their own length). When they move forward, they occasionally shake from side to side like drunkards. A more literary Mr. Sperm can walk into a perfect spiral shape, but literature and art are scarce after all, and this kind of Mr. Sperm only accounts for about 4%-5% of all sperm. Some of the remaining sperm gentlemen walk wild and like to go on the rampage; Others are imitative, and between literature and wildness, neither fish nor fowl.

Ps: Sperm can reach the fallopian tube in a few minutes.

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