Oh and I have to say, having experienced the "ring of fire" without any preparation, perineal massage doesn't scare me at all. 
If anyone is interested in knowing a little of what the "ring of fire" feels like, the best comparison I've ever come across is this:
Open your mouth as wide as you can then put your fingers in the corners of your mouth and pull as far as you can (obviously don't do yourself any damage!) until you can feel a "burning" sensation. That's the closest you can get to what crowing is actually like ime (although obviously everyone is different etc etc etc).
I feel someone should have prepared me for that before hand so I'm happy to help out for anyone else who thinks forewarned is forearmed!