In my, er, formulative years, Jane March was the go-to naked actress.
Thank GOD.
Thank GOD.
While this was back in the day, Josephine Baker spent quite a bit of time performing topless.
But, for the sake of relevance to the topic of this thread, how much of it was filmed?
Several male actors went naked so often on the series OZ that it was “there’s his balls again”. Christopher Meloni, Lee Tergeson being the two I think were naked most (though Luke Perry going full frontal was perhaps the most surprising).
OZ was good for that. Very VERY good for that.
I second that motion, Guinastasia.
I would also add Viggo Mortenson to that list. The man has never had a problem with nudity and going full frontal (when it’s integral to the plot, of course! 
).
That Glenda Jackson used to be a right shameless hussy!
How about Mathilda May ? Although it is one film that up her stats “cough” Lifeforce"cough", she did appear naked in other movies.
Amanda Donahoe must surely rate at least an honourable mention … first time I saw her in a movie where she kept her kit on (I think it was The Madness of King George), I was muttering to myself, “What, did someone in the costume department find a staple gun?”
What about somebody like Misty Mundae or Brinke Stevens? They’re not porno actresses but they do softcore T&A movies.
I briefly met Glenda Jackson a good few years ago (late 90s, probably) when I was a lowly drone at the Office of the Rail Regulator and she was a Transport Minister; all I could think of was “But, I’ve seen your minge!”