No, leave some. It helps you not getting yeast infections because it gets too tight, warm and no air.
Yes most people do, I do
Yes pubic hair will always grow back unless you have it perminantly lasered so hair removal cream, waxing shaving doesnt make a differenc, it will grow back
not all
Yes, unless you have a medical condition that prevents hair growth, or are receiving certain medical treatments (such are radiation to treat cancer).