“Before Edward ...” quips the poster for Pittsburgh Ballet Theatre’s upcoming Valentine’s Day production, “there was Dracula.”\n\nBetween those two vampires — reminds Erin Halloran, a principal dancer at the theater — are countless other mythological beings.\n\n“Vampires have been popular for a long time,” she said, singling out Anne Rice’s famous “The Vampire Chronicles” as an example.\n\nThe poster refers to Edward Cullen, the vampire heartthrob of the popular teen-book series, “Twilight.”\n\nPeople have always been fascinated with eternal life. Plus, Halloran said, “There is some sensuality in the whole idea of being bitten.”