Tijuana Bibles were popular from roughly the 1920s
through the 1940s. They were small in size and usually only
eight pages in length, leading to another term for them: An
8-pager. They were extremely graphic and frequently featured
the fantasy sex life of both real life celebrities and famous
cartoon characters. This is a long and honored tradition of
parody from the ribald woodcuts mocking the sexual habits of
the Royal Family during revolutionary days to today's Internet
photochops and animated GIF files.
Of course, don't parody Disney, unless you want
to end up like Dan
Given the compact format, the plots involved as
much sex as possible, usually with a situational punchline at
the end. They were not only the only available sex education
of the time, but also perhaps the only ponography as well.