Eva feels oppressed by her conventional parents who also relate to her relationship with the teacher Erik. Vera and Lasse live with their daughter in a depressing suburb environment. They want to break up and move to a more stimulating environment. Lena lives alone with her three-year-old son Pelle. Sven and Bibi live together in a narrow one-room apartment where they constantly go on their nerves. Sven sees the big family most as an opportunity for sexual experiments. Bibi, however, is jealous and afraid of the idea. In spite of that, she ends up with everything. A young French medical student, Paul, meets Bibi through common acquaintances and moves into the collective. The reason is simply that he has been attracted to Bibi. Meanwhile, Sven is increasingly interested in Lena.