I saw the movie in late 80s, but it may be of an earlier period. A woman due to anger or will to cheat on her husband/lover goes to an outside café, pulls a cigarette and is offer a light by several men, who later offer her money for sex. They go to a hotel, go upstairs and have sex with her one after another. There is a young man among them who is a bit shy and watching the woman while others have sex with her. She gets pregnant and is later brutally murdered and put in the car trunk by her husband/lover. Those are the approximate fragments I remember.