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Penis

SILENUS NURSING THE INFANT,  ITALY
The penis is part of two systems: the urinary system, and the reproductive system. In the urinary system, it transports urine during urination. In the reproductive system, it transports semen during ejaculation. The penis contains the urethra, which is a tube surrounded by strands of spongy tissue which fill with blood and enlarge the penis during an erection. [CG] {NR}

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