Although in male humans the passage between the abdominal cavity and the scrotal cavity is supposed to close off, so that the testes can't be drawn all the way up, there is one group of athletes in which it's deliberately kept open: Japanese Sumo wrestlers. I don't know if you have ever seen one these guys, but the average Sumo wrestler goes something like 350-400 pounds on the hoof. They enter their rigorous training in pre-puberty, and they perform deliberate contractions of the cremaster muscle, so as to maintain patency of the inguinal canal, and to be able deliberately to draw the testes up behind their pubic bones.
It's simply a matter of self-protection. Sumo wrestlers fight by throwing each other around and jumping on each other, and all they wear in the ring is a sort of diaper. Pulling the testes up behind the pubis gives them some measure of protection against the crashing blows of a 400-pound opponent. The thought of what would happen otherwise is almost too painful to contemplate.
Believe it or not, Sumo wrestlers are very highly regarded in Japan, and much like American rock music stars, acquire a following of fans, most of them women. A catastrophic accident would seriously impact on their--ahem--personal and social lives.
