In Australian tourist trap shops, they sell a kangaroo scrotum pouch as a bag for carrying coins. While I don't know if those things actually came from kangaroos or if they were some cow hide, it would be a little strange to carry my coins in the scrotum of a dead animal.
In human males, the scrotum holds the testicles in a pouch outside the body, which I am told, is because sperm production works better at temperatures slightly colder than core body temperature.
The scrotum can be partially retracted into the body, by way of the cremaster muscle. The cremasteric reflex, which causes the muscle to contract and accordingly shift the scrotum, can be elicited by gently stroking the inner thigh of the subject.
Embryologically, the scrotum arises from the same tissue that forms the labia majora in females.