Did women of the 40's and 50's not realize that stripping in the bushes for a little sun-bathing or a skinny-dip would lead to disaster? Men are scoundrels and will think nothing of stealing your clothes so they can oggle and laugh.
Not only that but artists seemed to be lurking in every shady copse, waiting for comely young things to disrobe so they could "paint their portrait". James R. Bingham wasn't alone in this pursuit - Coby Whitmore was at it, and even up here in Canada, our own Bruce Johnson was out hiking through the bush, doing some not-so-still life drawing.
And here I thought streaking started in the 70's!