Paramount Pictures has unleashed a red band trailer for "No Strings Attached"  and it shows how raunchy the film would be. Filled with some  adult-themed dialogs, sex scenes and F-word, the trailer also gives a  glimpse of Ashton Kutcher's naked butt. 
  Natalie Portman  takes the female lead role of Emma Franklin who makes agreement with  her friend, Kutcher's Adam Kurtzman, to start a relationship where they  have sex without involving any emotional baggage. But it's not long  before they learn that they want something more. 
  "My Super Ex-Girlfriend"  director Ivan Reitman serves behind the lens for "No Strings Attached"  with the script written by Elizabeth Meriwether. The romantic comedy  will make its way out in U.S. cinemas on January 21. 
  Another film with similar theme will also come out in 2011. Starring Justin Timberlake and Mila Kunis, "Friends with Benefits" from helmer Will Gluck is slated for July 22 release in the U.S. 

