Hello.... That's called erection ,you are still 20 so you don't have ides on this.. Its one among secondary sexual character like beard, broadened shoulder , rush of blood into penile veins causes bulging of penis.. Its also controlled by nerve .... Don't worry about that . . .
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Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
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