The worst thing about asshair is that it's impossible to shave. Waxing usually makes ingrown hairs, which would probably hurt like hell in that area. Nobody in their right mind would put a razor anywhere near there and an electric shaver pulling the hair out of the ass probably hurts like hell too.
Well, there is electrolysis, although for that I'm sure it's called electrolasses, but I doubt that would be too comfortable either.
Unfortunately we must face facts, we are doomed to wander the Earth with hair in our asses.