Information from Stefano who remembers seeing this film in 1990 and thinks it was produced in 1989 or 1988:
Petra, Giselle and Francine are credited on the cover. Male actors were Christophe Clark, Jean-Pierre Armand, Frank Mazard and an unknown young actor in the first scene.
There were four young actresses. The first one was an uncredited Deborah Wells (Petra?), having sex with Cristophe Clark (straight, to facial in a hotel room).
The second one was a just-beginner Andrea Molnar (uncredited and very young and busty!) (DP and facial with Cristophe Clark and JP Armand in a hotel room).
The third one was a very young and horny French-Algerian girl (Giselle?), dominating the film from the beginning to the end with five hot scenes (BJ and facial on the beach with unknown actor; BJ and facial on the beach with JP Armand; anal+facial on the boat with JP Armand; lesbo with Francine; DP and facial
with JP Armand and Frank Mazard).
Finally, the fourth actress was a young french girl (Francine?) (lesbo with Giselle; DP and facial with Cristophe Clark and JP Armand inside a roulotte).