However "ass hole' generally refers to a generic sort of person. Someone who cut you off in traffic, someone who throws a cigerette butt out of the car window.
"bitch hole" refers to someone close to you. A spouse who can get close enough to you to be a specialized "ass hole" to you and you alone.
Max: "No shit Trebek! I ding that chick Bevvy last week and now I am on 8 different penicillins and need my scrote drained every 24 fucking hours. She had the most diseased bitch hole I've ever stuck!!!"