If Jayne Mansfield lived long enough, she most assuredly would have been in Italian western, giallos, slashers and any other films that would have had her. She even made this film, a Eurospy takeoff, not long before her sad demise.
Some young people are on a scavenger hunt which brings them to an island close to Cape Coral, Florida, where the fountain of youth supposedly exists. The rich owner of the island gets his daughter (Mansfield) to kick them all out, but she only wants to see her chubby lover Irving, who somehow is the second person I’ve seen in a film with the trope of being completely uninterested in aardvarking with Jayne. Somehow, Irving has an evil twin named Herman and he has an evil woman in his life named Camille Salamander, played by Phyllis Diller.
Director Joseph Cates also made the sleazy Who Killed Teddy Bear? and somehow went on to produce the Tony Awards. This movie is so threadbare that when they ran out of money, instead of shooting the last scenes, they literally filmed the script.
You can watch this on YouTube.