Did you know - sumo's

[pdiggitydogg]

In my physiology book.
Originally, it was refering to babies and that when they were cold the testes moved back up, through the cavity.
It then explaned that regular men's can only tighten up to the body, for warmth or when the right area of the inner thigh is stroked.
THEN, it explaned that trained sumos can do it voluntarily.