Parents need to know that this movie is rated R for very strong language, nudity, explicit sexual situations (including group sex and bisexual encounters), and abuse of every kind of licit and illicit substance (even hotel room furniture). Many characters give the finger. There's an explicit close-up of a very unhygienic nipple-piercing. A gay character is insulted and fired from his job. The overall message is that the sex-drugs-and-rock-and-roll lifestyle is empty and destructive, but not unappealing, for a short time anyway. Interestingly, there is some suggestion that it is a cynical marketing strategy, though that appears to be rationalization. One nice shift from the usual format for this kind of movie is that Chris has parents who are entirely loving and supportive of his passion for metal, and genuinely enjoy the music themselves.