I recently saw this film on video, and it turns out to be merely the French-dubbed version of Radley Metzger's THE PRINCESS AND THE CALL GIRL.
Light and frothy, but not sexy enough by a long shot, film is hardly among the maestro's better efforts, though the French dubbing credited to Gerard Loubeau is very well done in terms of lip-synch. Given the glamorous Monte Carlo setting to which our leading lady Carol Levy is whisked away to, the French track fits, and perhaps was considered an improvement by Continental audiences.
Levy is a striking actress whose very unfamiliarity (she never got a career going) is a plus. One suspects Metzger was in a quandary by the time this film was produced in the burgeoning VHS era, as he had been used to being a trailblazer in erotica since his distribution efforts of the early 1960s right through to his classic Henry Paris hardcore films of the mid-'70s. Resulting PRINCESS (or call it MISS JONES) emerges as neither fish nor fowl and definitely derriere garde when it comes to porn.