A pin-up model is a model whose mass-produced pictures and photographs have wide appeal within the popular culture of a society. Pin-up models are usually glamour, actresses, or fashion models whose pictures are intended for informal and aesthetic display, known for being pinned onto a wall. From the 1940s, pictures of pin-up girls were also known as cheesecake in the U.S.[1][2]
The term pin-up refers to drawings, paintings, and photographs of semi-nude women and was first attested to in English in 1941.[3] Images of pin-up girls were published in magazines and newspapers. They were also displayed on postcards, lithographs, and calendars.-cited by Wikipedia.

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