Why does pubic hair grow faster than the hair on the head?

Maybe your crotch is possessed by a demon.

Anything south grows pretty fast

Further, why head hair falls a lot more than... also, grey hair appear on head first.. why why

You just think that cause your head spends so much time up your arse

i don't think it does

It doesn't

don't shave

Cause you don't trouble its growth by combing or dust :p

It doesn't although maybe it gives that impression.

Because the head is empty inside.

higher blood flow