movie name

i think it was a french movie from the eighties -- the opening scenes - the actress sticks her head out of the sunroof of a car moving through the city,
she is a violinist,
there is a scene where the actress, while talking with the actor who is also stripping, strips down to her panties and has rolled it down from her ass but stops and dresses again.
in a dark night scene - the actor is sleeping on the floor and the actress, fully nude and covering her front with a pillow, comes to sleep alongside him but he goes away (they apparently had a quarrel)