The allure of the "neighbor affair"—the clandestine romance blooming just a few feet away across the garden fence—has captivated audiences for decades. From salacious tabloid headlines detailing real-life neighborhood scandals to serialized dramas, novels, and the long-running adult film series Neighbor Affair (which spans over 60 volumes), the concept of the forbidden romance next door is deeply embedded in popular culture. But why does this specific dynamic hold such enduring sway over our collective imagination? The Psychology Behind the "Grass is Greener" Fantasy