香港三级片：隐秘背后的文化与社会反思自来水烧开后有一层白色漂浮物是什么

　　Until the end of the nineties, the Hong Kong cinema that explored the limits of sex and violence without shame was labeled "category III". Calum Waddell's new documentary, an exhaustive investigator of the mysteries of genre film, is immersed, through interviews and archival images, in one of the most wild and exciting popular film cycles.