I think I've known of reviews being removed if the punter contacted the people who run this site and explain why. I am a bit foggy about details but I actually think I got one of mine removed after a polite chat with the lady involved. I think it might have been to do with something like anal mentioned but not generally available (not sure on this) and it was removed.
Obviously the board management aren't going to get involved in changing any slight error in one review after another at punter or escort's every request.