On the set of Jack Tyler’s “Les Caresses de l’aube” (Caresses of the Dawn), an art house porn film with political content, the director, actors and guests confide in themselves one after another, revealing the little-known human facet of the French adult film industry. Providing an intimate glimpse into the hearts and minds of adult film workers, the behind the scenes documentary “Catégorie X” (Category X) explores the ways in which the internet is quickly destroying the passion and artistry of erotic film makers, and evokes the bygone golden age of X-rated French cinema.