What is the primary function of the scrotum?

The scrotum primarily functions as a pouch of skin that holds and protects the testicles. This structure is crucial for regulating testicular temperature, which is important for sperm production and overall male fertility. The testicles need to be kept at a temperature that is slightly cooler than the body's core temperature, and the scrotum facilitates this by expanding or contracting in response to environmental conditions.

While the other choices include components related to male reproductive anatomy, they do not accurately describe the primary and main function of the scrotum. The protection and temperature regulation provided by the scrotum play a vital role in maintaining healthy testicular function.