There's no escaping the concept of friends with benefits (FWB) these days. It has even inspired two big releases this year: 'No Strings Attached,' starring a 'Black Swan' diva and a former teen heartthrob, and 'Friends With Benefits,' starring, well, a 'Black Swan' diva and a former teen heartthrob.

The latter hits theaters this week, with Justin Timberlake and Mila Kunis playing the FWBs in question. The two gravitate towards each other after they're dumped by their respective mates (Emma Stone and Andy Samberg). Neither wants a big commitment after being burned, so they make a pact to treat sex like it's no bigger deal than a friendly game of tennis.