Sex with Mila Kunis: Justin Timberlake and Natalie Portman Can Compare Notes

It seems as if sex is one of the pervasive themes in two upcoming films featuring Mila Kunis. In "Black Swan", Kunis and Natalie Portman must explore the sexual dynamic of their characters. As two of Hollywood's leading female actors it will be interesting to see if they fall upon the often explored trope of a male heterosexual idea of sexuality between women.

In "Friends with Benefits" Justin Timberlake and Mila Kunis contemplate the possibility of a sexual relationship grounded in friendship. As is hinted in the trailer it is generally  believed that the idea of "friends with benefits" is a male driven exercise, but is this true? Can a woman be just as happy with the idea or as suggested here, does it require a penis? And how are the gender stereotypes turned when it is the man that wants more substance from a relationship than just sex?