Nope. If you shave hair off it will grow back. If someone has a problem with it they are dumb because it is a small irrelevant detail.
Yup. Humans tend to grow hair in many crevices. Including the butt crack and around your butt hole.
Do whatever you want with it and whatever you’re comfortable with. Everyone likes different things, but don’t determine what you do with your body based on other peoples opinions. If someone doesn’t like it, that is their problem, not yours. Do what you want bb.