P.S. I haven't had a genital / anal hair since about 1983 and my procedure works fine for a smooth feel and no-none-nada ingrown hairs.
I didn't have any in '83 either but that's because I hadn't hit puberty yet. LOL
Anyway, I like a good waxing by the lovely and gentle lady at the salon...she takes it all off for me and then the upkeep(whichever you decide on) is much, much easier.