I'm looking for the history of cunnilingus in an heterosexual view point; and I'm searching for documents, writings, records, of the act being performed. The first porn was created around the 1880's so I'm also wondering if we have any early visual records of cunnilingus being performed during that time as well.

I would like the earliest forms all the way up to the 1950's because I feel there are actually some good information around 1950's to present in regards to men performing oral sex on women.

It would be great if the early forms came from anywhere in the world yet the 1900's-1950's focused on the United States, but I would pretty much accept anything, or if I'm pointed in the right direction in regards to books, articles, sites that would also be great since when I Google it, I get 'How to' articles for men seeking to please their women. Or that one article about the history of fellatio. Also, I hope I'm posting in the right sub reddit. Sorry if I'm not.