Tales From North Platte

My cousin thinks that oral sex, along with other deviations of the sort, major or minor, did not exist before the late twentieth century.  He said something along these lines, and since I thought he was joking I said, 'Right, it was all strictly penis to vagina, throughout history, until just now.  His response, "I know right."  I don't know if he even realizes how old Latin is.