While the volume of the output of any part of the Japanese film industry makes truly comprehensive studies impossible, Sharp goes a long way towards giving an in-depth overview (if such a thing is truly possible) of the Japanese sex film industry, especially in light of its importance as a training ground and launching pad for many of the luminaries of Japanese cinema.
Thanks to nature of Japanese obscenity and censorship laws, and the lack of anti-sexuality culture that is part and parcel of the Abramic religions (Judaism, Christianity and Islam) the soft-core sex film, or Pinku-Eiga, literally "Pink-Film" was a staple of the Japanese cinema from the mid 1960s through the late 1980s as the film and theatre companies tried to compete with television for viewers. Since this was the largest segment of the independent film market in Japan, it was the primary area for talented writers, directors and cinematographers to gain skills and some recognition without the coveted degrees from the most prestigious colleges and long apprenticeships required by the major studios.
While the book is chock full of racy pictures and clips from the films discussed, it is primarily a history of the industry and its major players, not an exhaustive collection of reviews or analyses of the films themselves. As such, it should be required reading for any student of Japanese cinema and/or the Japanese film industry, as it makes clear the connection between this barely legitimate end of the industry with the better known and more respectable output of the major studios. In addition, several chapters chart the frequently lost and forgotten connection of the Japanese avant-garde art community, the independent film community and the radical global politics of the late sixties and early seventies.
Because of it's cover and the volume of photos one can see by flipping through the pages, it's easy to dismiss "Behind the Pink Curtain" as just a risque, exploitation coffee-table book masquerading as film scholarship, but it is truly an in depth history of an often neglected part of the Japanese film industry, and to date the most exhaustive treatment of the subject published in the English language.