Academy Award Winner Natalie Portman (Black Swan) and Ashton Kutcher (What Happens in Vegas...) star in the hilarious hit comedy that takes a modern look at what happens when friends-in-need do the deed. 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 friends stay best friends?