Remember when Halloween costumes were scary? Or creative? Or just plain fun? Not that a lady can't have fun dressing super sexy, but not EVERY costume has to be transformed into a Rated-R version. We've come to accept the sexy pirate, sexy nurse, sexy fire fighter, and even the sexy librarian, but we draw the line at sexy Mary Poppins and sexy Cookie Monster. Is nothing sacred?! We've rounded up the most horrific sexy costume incarnations of 2010. You may find them scary for another reason.