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A member asked:
Why does a man's penis become erect?
A doctor has provided 1 answer
Nerve signals: Due to sexual arousal cause constriction in blood vessels that make the penis fill with blood and become erect.
Answered 9/29/2016
4.9k views
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I have a bump on the tip of my penis that is more visible when erect. Its a very light blue color. It does not hurt, and it is soft to the touch. ?
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