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That is how they have sex, and that is how babies are made. Men produce sperm cells and women produce egg cells, and when the two cells join together, pregnancy results. Most men have this urge to want to have sex with women since sex is how new people are created. If nobody had sex, our species would become extinct. So nature gives most adults an appetite/desire for sex. If there were no urge to do it and it weren't fun, then people would neglect to do it.

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11y ago
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9y ago

For reproduction

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Q: Why do men put their penises in a girl?
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