In the film industry, unsimulated sex is the presentation in a film of sex scenes where the actors engage in an actual sex act and are not just miming or simulating the actions. At one time in the United States such scenes were restricted by law and self-imposed industry standards such as the Motion Picture Production Code. Beginning in the late s, most notably with Blue Movie by Andy Warhol , mainstream movies began pushing boundaries in terms of what was presented on screen. Notable examples include two of the eight Bedside -films and the six Zodiac -films from the s, all of which were produced in Denmark and had many pornographic sex scenes, but were nevertheless considered mainstream films, all having mainstream casts and crews, and premiering in mainstream cinemas. From the end of the s until the late s it was rare to see hardcore scenes in mainstream cinema, but this changed with the success of Lars von Trier 's The Idiots , which heralded a wave of art-house films with explicit content, [6] [7] such as Romance , Baise-moi , Intimacy , Vincent Gallo 's The Brown Bunny , and Michael Winterbottom 's 9 Songs Some simulated sex scenes are sufficiently realistic that critics mistakenly believe that they are real, such as the cunnilingus scene in the film Red Road.