Goldilocks and the Three Bares (1963) http://www.imdb.com/title/tt0057111/
Director: Herschell Gordon Lewis
Starring: Rex Marlow, Allison Louise Downe, William Kerwin, Netta Mallina, Guy Bonde
Thanks to MonsterMash for this rip! Not porn, not even softcore - just a few naked people.
"Suspicious of his girlfriend’s weekend disappearances, "skin-diving singing sensation" Eddie Livingston has a screwball friend trail her to -- gasp! -- Sunshine Park, a Miami Nudist Camp, in Goldilocks and the Three Bares, an early skinflick from cult legends David F. Friedman (Trader Hornee) and Herschell Gordon Lewis (The Gruesome Twosome), in "Buffocolor" and "Seemorescope!"
Goldilocks and The Three Bares is the thought to be "lost" second to last nudie-cutie from the legendary exploitation team of Herschell Gordon Lewis and David Friedman. The title can be misleading; the plotline has absolutely nothing to do with the famous fable which inspired the title. Appropriately billed as the "first nudist musical", it has considerably more depth than their prior attempts at this genre...The film was thought to be lost for over 36 years until Something Weird Video released it on VHS for the first time. Before its discovery, the writer of A Taste of Blood: The Films of Herschell Gordon Lewis, Christopher Wayne Curry, said in an interview with Lewis that he hope the film would be found one day, to which Lewis replied: "Oh my, I hope not." - wikipedia.org