Margo Stilley asked Winterbottom to refer to her simply by her character's name in interviews about the film. In New Zealand , while the Society for the Promotion of Community Standards lobbied for the film to be kept out of cinemas, it was passed uncut at R18 by the Office of Film and Literature Classification. If the movie were any longer, the onscreen events might become a lot more tedious, but there are just enough different things each time to avoid dull repetition. The sex is used as a metaphor for the rest of the couple's relationship. As such, some will find it a rewarding art house experiment with much to recommend it, others watching simply for the explicit and unsimulated lovemaking may well find it boring and pretentious. In Australia, the Office of Film and Literature Classification gave the film an X rating , which would have prevented the film from being shown theatrically and restricted sale of the film to the Australian Capital Territory and Northern Territory. And it is shot with Winterbottom's customary sensitivity. O'Brien is well endowed , while Stilley is all natural You may have seen a handjob onscreen, for instance, but have you ever seen a foot job? It's interesting, to say the least. In the United Kingdom, the film received an 18 certificate from the British Board of Film Classification and became the most explicit mainstream film to be so rated in the country. The film is unusual in that it features its lead actors, Margo Stilley and Kieran O'Brien , having unsimulated and very graphic sex, including genital fondling, masturbation with and without a vibrator including a footjob in a bathtub scene , penetrative vaginal sex , cunnilingus and fellatio. The site's consensus states: In the interest of sexual health and to avoid any possible pregnancy, O'Brien wore a condom on his erect penis during the vaginal sex but not while receiving oral sex.