Glamour photography or startled by the viewer. The subject would usually have an expression of delight which seemed to invite the viewer to come and play. During World War II pin-up pictures of scantily clad movie stars were extremely popular among American servicemen. Betty Grable was one of the most famous pin-up models of all time; her pinup in a bathing suit was extremely popular with World War II soldiers. In December 1953, Marilyn Monroe was featured in the first issue of "Playboy" magazine. Bettie Page was the Playboy Playmate of the Month in January 1955. "Playboy" was the first magazine featuring
Playboy calendar rather than for "Playboy". Hefner chose what he deemed the "sexiest" image, a previously unused nude study of Marilyn stretched with an upraised arm on a red velvet background with closed eyes and mouth open. The heavy promotion centered around Marilyn's nudity on the already-famous calendar, together with the teasers in marketing, made the new Playboy magazine a success. The first issue sold out in weeks. Known circulation was 53,991. The cover price was 50¢. Copies of the first issue in mint to near mint condition sold for over $5,000 in 2002. The novel "Fahrenheit 451", by Ray Bradbury,