Well it could easily be zero and it depends upon the mood, but I enjoyed and thought the sex was "realistic" in being erotic, clumsy, ridden with sudden false starts, impotence and sexual thrills. It is not porn because it is not violent enough and lingers on the erotic rather than the brutal.
Filled with erotic meanderings from the perception derived from women the film attempts to enter their day dreams similar to what I am picking up from the shades of grey books. Whereas women's daydreams were seen as chaste pure and settling upon babies and farms, this sees women stretching their imaginations to portray secret desires. They are based upon lesbianism, frottaging, multiple piercings, flirting, going down on the spot, instantaneous couplings and numerous other themes from the imagination.
It is not a startling film where you go wow what was that, but in a way, despite it being done before, it is a subversive film, chiming in with a modern post sensibility where the men are generally bewildered by what they are supposed to do. Male identities are eroded through a loss of job and the women therefore take on a different guise as new freedoms and responsibilities are placed upon them.