My favourite mud wrestling photo, from the Pictorial History of Wrestling. Took place in Clapham, London in 1938, two women wallow in a pool of lovely gooey very sticky clay in swimsuits and of course, rubber caps. I wouldn't mind an erotic mud bath in front of a cheering audience :

https://www.gettyimages.co.uk/detail/news-photo/british-mud-wrestler-mary-brewer-fighting-it-out-with-news-photo/3314850?adppopup=true

I wonder if other photos, and perhaps film, exists of this.

I know of one other, in early editions of the book Fighting Sports by Graeme Kent. Haven't seen it around though since my schooldays!.