Well, you wouldn't think so from the lack of love for "beast races", however, in a few of the books there are hints toward Furries. In Confessions of a Khajiit Fur Trader there is the line, "Humans most often bought tails and ears. I had to employ an alchemist and a master craftsman for a couple odd requests, but I didn't ask questions when the gold piled up." I think that is a reference to fursuit building. Then there is, The Lusty Argonian Maid (Vol 1 & 2), the Argonian (Reptilian) is named "Lifts-Her-Tail".
I don't know if mundanes use that phrase, but I have never heard it from one. *shrugs* It's nothing big, but it is interesting to me, and it proves a personal point: in-game books contain a peek into the minds of the designers that is a little more raw than the rest of the game because of the unlikeliness that people will actually read any but the necessary in-game books.
Apparently, I am not the only person in the world who thinks this, because there does exist This Website that is devoted to transcribing the books to the net.