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How does the urethra function in the penis?

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Front view anatomical diagrams of the male and female reproductive systems, with labeled organs including penis, testis, prostate gland, uterus, ovary, and vagina. — human reproductive system Organs and structures of the male and female reproductive systems.

In the male, the urethra serves as a dual-purpose channel that conveys both urine from the bladder and semen to the exterior of the body.12

Within the penis, this section is known as the spongy urethra. It traverses the length of the organ by passing through the corpus spongiosum. During the processes of urination and ejaculation, the urethra opens to allow for the passage of these fluids; at other times, its walls remain in contact with one another.12

The spongy urethra also receives secretions from the bulbourethral glands, which enter the channel approximately 2.5 centimetres below the urogenital membrane, as well as from various mucous glands located along its length.1