Question

Why penis become erect and enlarges at night and day dreaming?
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Answer 1

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☞When you first wake up, you are often coming out of REM sleep. In addition to the vivid movie-like dreams that are characteristic of REM sleep, the penis also becomes erect and engorged with blood during these periods. This is due to the activity of the parasympathetic nervous system affecting the sacral nerve....ツ