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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.

The average erect penis was 5.16 inches (13.1cm), while the average flaccid penis was 3.61 inches (9.2cm). Yes, how hard is too hard to yank for a study?.

WebMD explains the parts of a penis, how you get an erection, and how ejaculation happens.

The blood flow is needed for the penis to become erect. Diets that Blood pressure drugs can make it hard to get an erection. But doctors say.

Learn how a firm erection normally gets and why a hard erection matters to 2 – Penis is hard, but not hard enough for penetration; 3 – Penis is hard enough for.