4. Friends With Benefits - Sex With Justin
From a purely aesthetic perspective, 50 Shades needs an incredibly hot leading female: while all the talk since its announcement has been concerned with who should play Mr Grey himself, the idea of having a leading lady who will shrink in proximity with the raunchy entrepreneur, would completely undermine the project. Even though Grey is the object of the reader's intrigue, viewers would have to believe that he would fall so completely for his Anastasia that he would be willing to break all of his rules, and by the end of the trilogy give up everything that has come to characterise him so far (such an achingly on-the-nose allegory for male/female relationships, that.) And not only does she need to be intriguing enough and charismatic enough to hold attention, she has to look stunning, both dressed and undressed, and the much-revisited sex scene between Kunis and Justin Timberlake in the sex buddy comedy Friends With Benefits certainly shows Kunis has form and the right credentials. This is also just about as openly naked as she has ever been - though she did once again use a nude body double for some scenes, and it seems she might be getting a little more adventurous as her career develops.