Guarda Streamingcommunity. The coming-of-age story of young milkboy Martín (García Bernal). While his friends Jesús (Altomaro) and Roberto (Mora) are cocky and apparently they have a lot of experience in sex, young Martín is shy, quiet and virgin. Everything changes when the young cocky boys want to prove they're men and go to a brothel without Martín.