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Anonymous
All of this can be summed up to this information: a flaccid penis is a "tense" penis. When you are erect, your penis is actually relaxed. Doesn't make sense? Well, in order to get hard, blood enters the penis through veins. When you're flaccid, your penis is tense which causes your body to keep the veins constricted (much like kinking a garden hose). When you get an erection, it's actually your penis relaxing and "unkinking" the veins letting blood flow in easily.
At night you're sleeping. Your body is completely relaxed. So, it'd be natural that your penis relaxes, too. What happens when your penis is relaxed? Boner. Ta-da!
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