This is an illustration from The School of Venus - a sex manual originally written in French and published in English in 1680.
It's not a clinical treatise but takes the form of a dialogue between a teenage girl and her more experienced cousin. And there's no author - it was published anonymously. If you want to read the 166 page book, it's been digitized by Google Books.
There really is nothing new under the sun. I'll take some penis sausage ;)