Oral sex has been around for a long time, as this Roman wall painting from Pompeii shows. For those of you who may not know, Pompeii was an upper middle class city destroyed by the eruption of Mt. Vesuvius in 79 A.D., at the height of the Roman Empire. Buried under volcanic ash for centuries, it was rediscovered in 1599 and has since then been mostly excavated. It is the most well preserved Roman city from antiquity and presents us with a unique insight into the every day life in the Roman world at that time.
I find this painting interesting, showing as it does that cunnilingus was not unknown in antiquity. How widespread it was is of course hard to say, but that it did occur is obvious from this painting. It would be interesting to know how many people from that time may have found this image stimulating, or just curious.
And again, as this painting shows, erotica, both art and writing, has been around for millennia. The study of antiquity usually reveals how much human nature stays the same over long periods of time and even places. An enjoyment of things erotic seems to be part of that unchanging nature.