The penis is a male reproductive organ that plays a key role in sexual reproduction. It is primarily composed of erectile tissue, which can fill with blood to become firm and erect during sexual arousal. The penis also serves as a conduit for urine to leave the body, sharing a pathway with the urinary system. In addition to its biological functions, the penis is often associated with various cultural and social meanings. It can symbolize masculinity and virility in many societies. Understanding the anatomy and functions of the penis is important for sexual health and education, as well as for discussions about related topics like sexuality and reproductive health.