Page last reviewed: 6 April Next review due: 6 April Talking about sex Before sex: what to ask your partner Where can I get sexual health advice, now? Am I gay, lesbian or bisexual? The cause of night-time erections isn't fully understood. Blood builds up inside 2 cylinder-shaped chambers, causing the penis to swell and stiffen. Penis health 5 penis facts Penis size How to keep a penis clean Penis enlargement Penis problems. Researchers at University College London measured the penises of men, including teenagers and pensioners. The swelling blocks off the veins that normally take blood away from the penis.
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