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why? why all man get hard on penise thing middle of night?
[ ] Want to answer more questions in the Health & Fitness category? Maybe give some free advice about: Health?
Are you the same person asking all these questions relating to sex/men?
If you are, please stop, and just use Google.
If you mean whilst they're sleeping and during the morning, read:
"A man's penis becomes erect in response to sexual arousal and excitement, but it can also become erect as a result of deep relaxation, such as what's experienced in deep sleep with or without dreams. An erection is caused by a rush of blood to the penis. A man's penis, especially a young man's penis, can also become erect without any kind of arousing stimulation this is called a "spontaneous erection."" ]
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