Was geschah wirklich mit Miss Jonas?

The name of this movie is Was geschah wirklich mit Miss Jonas? released in 1974-03-29 and it's main theme is Was Miss Jonas a porn star possessed by the devil or just a great bitch? A private working for a wealthy businessman investigates. The true story of the photo model Christa, who worked as a painter model and call girl before she was to star in Miss Jonas..