Équation à un inconnu AKA Equation to an Unknown (1980) - Francis Savel

Plot Synopsis from imdb.com
Paulette, a nude model from France, has recently settled in the United States with her husband, a photographer. After dropping her husband off at his studio, she goes to work posing for a nudie photographer. During a break from the photo session she falls asleep and dreams that she visits a night club, goes hitch-hiking, and is chased through the woods and along a riverbank by a crazed would-be rapist who ties her up. She is rescued by a handsome man and is later chased by an ape. The handsome man is temporarily abducted by four naked native women who drag him into the river and dance to rock 'n' roll music.

Équation à un inconnu AKA Equation to an Unknown (1980) - Francis Savel

 

 Quote: This long-lost masterpiece of gay erotic cinema centers on a handsome young stud who rides his motorcycle through myriad of sexual encounters, from a soccer game's locker room to a dreamy and unsettling orgy where the film reaches its melancholic peak. Newly scanned in 2K from the original camera negative and directed with absolute grace by the mysterious Dietrich de Velsa (aka Francis Savel / Frantz Salieri): this former painter was also the owner and artistic director of one of the first transvestites' cabaret of Paris, La Grande Eugène. Years later, he collaborated with Joseph Losey on Mr. Klein and Don Giovanni. EQUATION TO AN UNKNOWN is his only film and stands without a doubt as a masterpiece and the best French gay adult film ever made.