My soon-to-be traveling companion just read a book where a character was an "everything but" girl (a virgin that does HJs, BJs, rimjobs, etc). Surprisingly, new girl didn't know what a rimjob was.
She didn't seem turned off when I told her. So I have one thing to say. Brilliant!
Full disclosure: Despite my love of scatological humor the rimjob thing is not a joke. They really do feel great. Contrary to some on here, liking rimjobs doesn't make you gay. Unless you like rimjobs from other men. If you do that is gay. I like rimjobs from women, so I'm not gay. Not that there's anything wrong with that.

How old is she? I can imagine an older woman not knowing, I suppose, it was pretty edgey for us. It's pretty much completely mainstream for the generations that have followed us, though; nearly impossibly a 20-year-old won't have heard it (or experienced it), IMO