It looks like you’re referring to a specific release (“Happy Few aka Four Lovers 2010 DVDRip Sonata Pr...”).
The four quickly become inseparable, agreeing to a "guilt-free" exchange of partners without formal rules. While the initial phase is euphoric and focuses on sexual liberation, the arrangement begins to fray as genuine romantic feelings, jealousy, and the logistical strain of their double lives—including their overlooked children—take a toll. Happy Few aka Four Lovers 2010 DVDRip Sonata Pr...