No Strings Attached (2011)

Cast: Natalie Portman, Ashton Kutcher, Kevin Kline, Cary Elwes, Greta Gerwig, Lake Bell, Olivia Thirlby, Ludacris, Jake Johnson, Mindy Kaling

Emma is a busy doctor who sets up a seemingly perfect arrangement when she offers her best friend Adam a relationship with one rule: No strings attached. But when a fling becomes a thing, can sex frie…