The penile shaft is composed of spongy tissue that traps blood to maintain erections. This spongy tissue, called the corpus cavernosum, surrounds both sides of the urethra, which is the passageway...
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: Sexual evolution: understanding the mechanics of male arousal and erectile function
The Penis Does Not Contain Muscles; Erections Result From Vascular Changes
An erection occurs when blood flows into the spongy tissue inside the penis, making it swell and become firm. This...
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: Erectile dysfunction treatment options and understanding how it works
