Now one day, a cell splited abnormally. The middle part of the cell left the outer part and became two different kinds of cells, a male cell and a female cell. Please wait to see the picture move.
male and female

The reason for this abnormal split could be: radiation, lack of nutrition, germ infection,etc.

Now we have a male and a female. Male can't reproduce since male's negative charge is too strong and avoids it from splitting. A group with a very strong central power does not split.
male can't reproduce

Afemale has the potential to split (reproduce) but does not split until it receives some negative charges from the male.

female can reproduce

So a male must mate with the female in order to inject negative charges into the female.

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