The film follows several couples over one night in Brno. The focus is on a 20-something couple with unspecified learning difficulties, Olinka and Standa, who are preparing to have sexfor the first time. Standa has been receiving advice from his brother Jarda, while Olinka has been given tips and guidance by her friends, the women who live in her apartment block. Standa and Jarda travel to Brno from Brundal for the occasion. Meanwhile, in a nearby pub, depressed actor Mirek is with psychologist Vlasta, complaining about his life, and the two presently return to Vlasta's flat together where they have sex, and Vlasta counsels Mirek about the state of his marriage. In the same pub are Jaroslava, a young woman who habitually attracts unpleasant men, and her current partner Richard, a pretentious and self-absorbed man who is tempted by sexual experimentation and submission. This couple return to Richard's flat in the same apartment block where Richard persuades an unwilling Jaroslava to spank him, alongside other requests. Also in the pub are life-long friends Honza and Pavel. While Honza rambles drunkenly about his desire for various women, Pavel has an undeclared love for Honza. At the house, Olinka is horrified to see her controlling mother return unexpectedly to the flat. Panicking, she administers rohypnol into her mother's coffee, and locks her unconscious in a storage cupboard. Standa arrives and they visit Olinka's friends so Standa can be vetted for their approval. Back down in Olinka's flat, Standa and Olinka share an awkward meal, and then proceed to the bedroom and are extremely nervous, but eventually Olinka manages to initiate sex. Despite Jarda's training, Standa is unable to put on the condom, so they do not use one. Meanwhile Jarda arrives at Olinka's friends' party upstairs to drink with them. Meanwhile, Mirek leaves Vlasta's house to go home, but on the way has a drunken argument with his wife on the phone, and ends up walking home to Líšeň in a drunken depression. Honza and Pavel also head home to Pavel's house, and Pavel is perturbed when Honza kisses his cheek while he sleeps. After having sex, Olinka excitedly tells her friends what happened, but at the same time her mother wakes up and sees Standa dancing in his underwear through the keyhole. When Olinka returns to the flat, the two women argue, and Standa flees the flat in panic. Pavel and Honza leave Pavel's place very early to deliver rohlík to Líšeň, but on the way Pavel takes his eyes off the road and hits Mirek, killing him. Comforting Pavel, Honza confides that his love is returned. Meanwhile, Olinka releases her mother from the pantry, but then locks her in again when Standa returns to her. A voice over confirms that Olinka is pregnant.
