The cause of night-time erections isn't fully understood. Whatever their cause, most doctors agree that night-time erections are a sign that everything is in working order. The penis is not a muscle Contrary to popular belief, the so-called love muscle does not contain any muscles. Blood builds up inside 2 cylinder-shaped chambers, causing the penis to swell and stiffen. The swelling blocks off the veins that normally take blood away from the penis. Talking about sex Before sex: what to ask your partner Where can I get sexual health advice, now?
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