Episode 3: Two characters engage in sexual activity in a bathroom. No nudity is shown but they kiss passionately, the guy undresses from the waist down, she pulls up her dress and is thrusting while he is siting on the toilet lid.
Episode 4: A woman is having sex with her partner, no nudity is shown, except a close-up of their skins close to each other and her face with pleasure, but there is loud sexual panting that also signals the beginning of the scene.