15 Lessons Movies Can Teach Us About Cheating

Lesson: Affairs can be intensified by a shared traumatic experience.

The affair between Maurice (Ralph Fiennes) and Sarah (Julianne Moore) unfolds against the backdrop of World War II-era England, and couple's steamy and romatic sex feels weightier with the sound of air-raid sirens in the background. The way the affair ends only makes it that more melodramatic.