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The penis getting stiff is called an "erection". This can result from different sexual stimuli - such as seeing a naked woman, or a photograph of one; touching a woman during foreplay, etc.; it can also result from yourself, or somebody else, touching your penis. You can also sometimes get an erection spontaneously, i.e., without any apparent cause.

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7y ago
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13y ago

They get a boner or erection. Useally when the male is sexually aroused

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15y ago

There are small valves in the blood vessels that close when a guy gets sexually aroused. This allows the penis to fill with blood making it hard. when u see some 1 hot

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7y ago

The cause of erections or stiffening of the penis is a vascular tissue called the corpus cavernosum. This tissue has spaces which fill with blood causing the penis to enlarge and stiffen.

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15y ago

Look at it.

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Q: Why does a guys penis get stiff?
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