I've suspected for a while that 'cunt' as an insult was making a move into the acceptable NZ cusswords list. In my experience it's been off the menu for respectable liberals like myself, a notoriously prudish group. At uni, it was always tricky using it around the OUSA.
When one of the Phoenix Foundation recently used it in a Twitter post, I know we where making headway on it. I attribute this to UK pop culture, as the US seem to use it mainly anatomically.