La nymphomane perverse (1977)

Director: Claude Pierson (as Caroline Joyce)
Studio: Pierson Productions

Starring: Gilbert Servien, Edwige Davis, Laurence Jarry, Vicky Mesmin, John Oury, Richard Allan, Desire Bastareaud
—A slightly frigid wife is the initiative of the satisfaction of her husband, caught in a whirlwind of debauchery that will make her a perverse nymphomaniac. A record number of spectators came to applaud this masterpiece of perversity on January 26, 1977 in the ALPHA-FRANCE Movie theaters.

—A new wife (Edwige Davis) proves reluctant to indulge in the kinkier aspects of sex, i.e. blowjobs. Her husband has made arrangements, however. He leaves on a trip and places a key to the outhouse in a draw, telling his wife she must not go there (I deduce). She succumbs to curiosity though and goes to peep in. She sees Chantal Virapin masturbating. She masturbates herself while she watches and then runs for the key, goes in and joins the girl for a g/g session.
These events are repeated with increasing numbers of participants and increasingly extreme sex acts. She sees and joins.
After this we see her in bed using two dildos on herself.
Then outside, all the above plus a black dwarf take part in an orgy. She stands to watch and masturbate while the dwarf whips Chantal Virapin and then gets the same herself. She watches the unidenfited female take another reverse cowgirl DP and Chantal ride the dwarf, joins in the group sex including sex with the dwarf both in a twosome a threesome and a four/fivesome (DP). It is at this point that another male suddenly appears and the husband returns and looks on with approval.
The last scene is of a husband and wife session now including oral, 69 and anal.

Alternative Titles:
Always Horny – Perverse – Ninfomania perversa – Perverse Desires – Perverse Nymphomanin