In the film, previously known as “Friends With Benefits,” a guy and girl try to keep their relationship strictly physical, but it’s not long before they learn that they want something more.
Thirlby would play Portman’s sister in the film. Greta Gerwig, Kevin Kline, Ophelia Lovibond and Ben Lawson also co-star.
The script was written by Elizabeth Meriwether. The studio is planning a January 7, 2011 release.