The Couples of Boulogne (1974)

This film rated xxx was the first in France to have a descent story and was filmed by a team of professionals who came from the world of advertising cinema like its director Christian Gion,and which was to be released in the theaters of a major French franchise.
The theme of the film is "couple seeks couple" and was filmed in the real places where the orgies of a wealthy class took place in the Paris region.
The film was very well received by critics, but had many problems with the French censorship board and could not be shown in general audiences theaters.
A detail: the character around which the story unfolds, is a transgender actress, star in one of the cabaret shows "L'Alcazar de Paris".