In his “On Archer’s Underground Comix Roots,” Charles Bock discusses the history of adult Comix and how they laid the foundation for cartoons like The Simpsons and Archer. Bock claims:
Comix. That sudden x. In 1958 the Motion Picture Association of America slapped Xs on what it determined to be adults-only fare. In the late Sixties, the x provided the fledgling cartooning genre with separation from “legitimate” comic books, the crossed final letter offering both warning and thrill… The young artists were ravenous to test their abilities; like the era’s emerging postmodern fiction writers, they were fluent in their chosen medium and knowledgeable about contemporary art and art history. They were also tripping balls.