The muscles do this by putting pressure on the penile veins. muscle weakens, it is unable to prevent blood from flowing out of the erect penis. Find out facts about your penis, including erections, penis length and how the penis can break if violently twisted when erect. Erections & How They Work. The Penis Has 2 Chambers Called The Corpora Cavernosa. They Are Made Of Spongy Tissue & Can Fill With Blood To Grow In.
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