In Santiago, Chile, the schoolteacher Luisa proposes a debate about sex with the parents of her students with the intention of giving classes about sex education to the youngsters.

When Camilo and his girlfriend, Pola, start to struggle in their relationship, she asks for a week away from him to assess the situation. Although Camilo agrees, he feels confused, as his undemanding life is made uncomfortable for the first time. Soon he meets Mikela, a disaffected teenage girl whom he befriends. However, when Camilo discovers Mikela's past diagnosis as a schizophrenic, he begins to worry about her safety.

Cecilia Ureta, host of Chile's highest-rated news show, announces the results of a United Nations survey, the conclusion of which states that 62% of Chilean women are or have never been unfaithful. Ironically, Cecilia maintains an extramarital relationship with the network's owner. Maliciously, a rival colleague discovers this during a live broadcast, with tragic results. The revelation spreads becoming a conversation of national interest.

Since their parents split up, Sara and her younger sister live with their mother, whose new partner is a woman. Everyday life for the four of them is hardly any different than it is for other families. But not everyone sees it that way – Sara's father in particular has his doubts. As Sara’s 13th birthday approaches, she feels rather overwhelmed: her first crush, a body in the midst of changes and to top it off, conflicts over loyalty with her parents.

Julito is a shy and insecure young man who works at the Night Club “El Tiburon”, where he aspires for the impossible love of Rossi, the main showgirl and also the owner's girlfriend.