Czech-born photographer Jacques Biederer relocated to Paris, France in 1908, and was followed by his brother Charles a few years later. Their photographic studio, Studio Biederer, specialised in underground and taboo images of sexual fetishes, lesbianism, flagellation, and other erotic subjects. As well as publishing these images as clandestine prints under the name Éditions Ostra, the Biederers also produced a number of fetish sex films for secret projection. Paris Sex Underground collects 60 duotone images originally produced by the Biederer brothers, covering the full range of their extraordinary and ground-breaking work, work which paved the way for later SM pioneers such as New York's Irving Klaw.