One El País review noted: "Episode 5 asks the question most shows fear: What if polyamory just makes monogamy’s problems worse?"
While the women grapple with emotional betrayal, Rubén represents the masculine crisis of inadequacy. In Episode 5, Rubén’s fixation on his wife Barbara’s pleasure turns toxic. He installs a hidden camera in their bedroom (a chilling moment shot with Hitchcockian tension) to see if she masturbates to the memory of her night with their friend. El juego de las llaves Season 1 - Episode 5