Blowhard, Esq. writes:
The film tells one day in the life of a young adolescent girl who is discovering her sexuality. Francesca (Catherine Spaak), a 17-year-old girl, who has a vivid dream of making love to Enrico (Christian Marquand), a 37-year-old divorced architect and family friend. She skips school to watch lovers as she contemplates whether she should act on her feelings.
And via YouTube, here’s the first four minutes of the movie (it’s not the trailer):