Joy of Flying (1977) on Netflix

Young and attractive woman Sylvia (Corinne Cartier) runs a successful fashion boutique and neglected by her husband Kurt. He is more interested in TV and six-packs than the charms of the opposite sex which makes her frustrated. During the trip to a psychoanalysts congress, she dreams similar to Jong's heroine Isadora while reading the emancipatory novel titled Joy of Flying Into Own World. First she has sex with her girlfriend's lover and then an affair with the businessman Jörg. She finally realizes that the total enjoyment of all sexual day and night dreams alone makes no one a free person.