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1. www.webmd.com › erectile-dysfunction › how-an-erection-occursPenis: Anatomy, Picture, Erection, and Ejaculation - WebMD

   www.webmd.com › erectile-dysfunction › how-an-erection-occurs

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   2024年5月17日 · What Is an Erection? An erection occurs when your penis fills with blood, causing it to expand and become firm. You might have an erection if you feel sexually aroused, though sometimes they just...