Whenever they want. Not all women do though.
Nope. That's a personal preference. They don't have to, but (not to be rude) some guys don't like the bush. ANSWER: Agreed, no requirement for a girl to shave. But, what shaved girls learn is that...
I guess it depends on if you want to risk getting nicked or not.If you want to have sex, then yes.
Carefully
because they want to get laid. and it's cleaner
Dealing with Ingrown Hairs
How to Get Rid of Ingrown Hairs
How to Manage Chest Hair for Men
Why Women Grow Gray Hair Down There