Oddly enough, the game of musical beds is in fact set to music. Cheesy songs and dance numbers abound, the former not too hard on the ears, but the latter--replete with excruciating Lambada-esque moves--as likely to induce suicide as an Academy Awards show number. And while infidelity is as fair game as any other subject for a musical--see Lars von Trier's exquisite tragedy "Dancer in the Dark" for a true boundary-pushing example of the genre--"The Other Side of the Bed" doesn't offer up a stitch of insight into the issue. No one is called to task for their transgressions, and ultimately no one shows any remorse for their lecherous behavior. Throw in a few stereotypical supporting players, including a talky single woman, a thin-skinned macho man and an ultra-aggressive lesbian, and the flaccidity is complete. Lightheartedness is one thing, but trivializing cheating while failing to do so with humor or creativity makes for an unsuccessful if not unseemly film. And at nearly two hours in length, "The Other Side of the Bed" allows plenty of opportunity to close one's eyes in protest. Starring Ernesto Alterio, Paz Vega, Guillermo Toledo and Natalia Verbeke. Directed by Emilio Martinez-Lazaro. Written by David Serrano. Produced by Tomas Cimadevella and José Sainz De Vicuna. A Sundance Film Series release. Drama/Musical. Spanish-language; subtitled. Unrated. Running time: 114 min.