I said when I can be bothered.
I have never had a professional wax done, like someone else said - it isn't the pain I'm worried about, just someone getting that "close" to me! I'd be mortified. It is one thing to have someone look at me while giving birth (I soooo didn't care at that point) but at any other time, my privates are for me and DH only.
Usually I trim and shave the edges - used to wax the edges but I can't be bothered these days and I never go swimming either so it is really just so that I look ok in my undies before whipping them off, LOL.