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If your penis is hard it might be cause for alarm as a hardened penis could be a symptom of HIV infection. When HIV gets into your body, whether it be by direct skin-to-skin contact or by inhalation, it causes your entire system to go haywire. The lymph nodes all over your body swell up, you may start to bleed from previously healed wounds and your genitals may will swell up or harden. You should consult a doctor immediately.

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16y ago
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13y ago

Because you probably think about other things and then u forget that u even have the erection. Erections happen to everybody at every age. If u want to keep your penis erect, then think about sex things, or something else that u enjoy! :)

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Q: Why are penises hard?
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