Manuel Ferrara’s “Raw” series takes viewers behind the glamorous trappings of commercial porn to expose the private erotic doings of the adult video world’s horniest performers. In “Raw 13,” a deluxe two-disc set chronicling Manuel’s latest personal dating adventures, the French director/stud reveals the nasty ways his passionate, sexually driven co-stars fill their time off the set. There’s no plot lines, camera crews or sets, just a camcorder showing unscripted, unposed bedroom reality.