What is the primary role of the penis in human anatomy?

The primary role of the penis in human anatomy is to facilitate sexual intercourse and the transfer of sperm. This function is critical for reproduction, as the penis provides the mechanism through which sperm is delivered to the female reproductive tract during sexual activity. The anatomy of the penis, including structures such as the erectile tissue, allows for an erection that supports penetration during intercourse. Additionally, the ejaculation process releases sperm from the male reproductive system, enabling fertilization if it encounters an egg.

While the penis does have other functions, such as assisting with the passage of urine, its main and most significant role is related to reproduction. The other options do not accurately reflect the primary physiological functions of the penis in human anatomy.