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Around the base of the head of the penis is a raised rim, or ridge. This is the corona. Sometimes it has a darker color than the rest of the head. The head of the penis is called the glans penis, or just the glans. When the penis is flaccid, or not erect, the corona, and most, if not all, of the glans are covered by the foreskin in males that have not been circumcised. During erection the glans and the corona become enlarged. Often the corona will flare out, creating a more prominent ridge when erection occurs. If the male is not circumcised, the foreskin usually retracts during erection, and the corona helps to keep the foreskin in the retracted position, allowing the very sensitive glans to be fully exposed.

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13y ago
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Q: What is the corona on a penis?
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