 Another early form of pornography were comic books known as Tijuana bibles that began appearing in the U.S. in the 1920s and lasted until the publishing of glossy colour men's magazines commenced.These were crude hand drawn scenes often using popular characters from cartoons and culture.In the 1940s, the word "pinup" was coined to describe pictures torn from men's magazines and calendars and "pinned up" on the wall by U.S. soldiers in World War II.