Yes some men shave their anus as well as the pube area and the scrotum. The smooth anus is often more appealing when engaging in rimming. The act of using the tongue in the anus.
There are several methods. You can pluck, shave, or wax. This is one of the areas that Brazilian waxes cover.
I never heard of hair around the anus. I've never seen an anus with hair.
No, it's even healthy.
There is hair that usually grows around the anus, but the rectum has no hair.
Yes; that is perfectly normal.
to cut hair with a razor ... shave