Originally posted by poon cho tang:
[b]Scrotum
The scrotum is a sac that hangs behind and below the penis, and
containts the testes, the male sexual glands. The scrotum's primary
function is to maintain the testes at approximately 34 C, the
temperature at which the testes most effectively produce
sperm.
Male Internal Sexual
Anatomy
[/b]
waliew, 34 degree, hotter than the jingapore weather....
but doesnt explain why must expand shrink.. 
