Indoors in a bedroom, fiancé gets frisky with his fiancée as she stands in her underwear changing. He fondles her genitals, buries his face and removes her tampon. He lays her down on the bed, and sex is implied. Later that evening, they lie together on their bed, moving rhythmically and panting, implying sex; lighting doesn't allow for further detail.
At a campfire at night after her fiancé has gone to bed, fiancée ends up talking with their trail guide. He asks if he can kiss her and they end up having a passionate kiss. Lying back, he begins to fondle her but she breaks it off suddenly and joins her fiancé. Her fiancé then becomes amorous but she suddenly gets nauseated and leaves the tent. No nudity.
As an engaged couple, Alex (Gael García Bernal) and Nica (Hani Furstenberg) lie together in their tent. She becomes aroused and clearly fondles his genital area through his pants. She tries over and over as he resists. He tells her their trail guide is too close to their tent and he doesn't want to be overheard. There is no nudity in this scene.
The film opens showing Nica (Hani Furstenberg) in full frontal nudity while jumping on a trampoline. Her labia are mostly obscured by her pubic hair. This is followed by her shower. Female bare buttocks are seen at night as a woman urinates on the ground. Woman is seen in bra and panties briefly. Men are seen outdoors wearing just briefs.