The Egytptian kama sutra.
I get this feeling that sources like this highlight how universally human martial art wrestling is.
Ars Ensis in Hungary has a studygroup on this this as a side project. They showed me some last summer, and it was nice stuff. With little work they could hold a class of it in some event. You have to have a broad set of wrestling skills to be able to study this source, but if you have such a group, it seemed a fun thing to play around with. To my eyes, the variety of techniques is quite remarkable.