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This means that in the event of a rival male's sperm residing within the of a female, the human penis is able to displace the rival sperm, replacing it with his own.

The is the visible ridge between the halves of the penis, found on the ventral or underside of the penis, running from the meatus opening of the urethra across the to the area between scrotum and.

A man at 44 sustained an injury after an accident and his penis was severed; became difficult as his urethra was partly blocked.

"Adaptation to Sperm Competition in Humans".

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The urethra traverses the corpus spongiosum, and its opening, the , lies on the tip of the glans penis.

Apart from a , perhaps the most radical of these is , in which the urethra is split along the underside of the penis.

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