Pin-up : Une pin-up est une représentation de femme, dessinée ou photographiée, dans une pose aguichante ou « sexy », d’où l’expression anglaise de « pin-up girl » qui pourrait se traduire en français par « jeune femme épinglée au mur ». Le mot est employé pour la première fois en 1941. Depuis leur apparition, les pin-up sont restées un symbole de charme et d’érotisme régulièrement remis au goût du jour, tout en devenant le témoin d’une société marquée par une conception objectiviste de la femme. Pin-up sur Wikipédia (fr) 

Pin-up model : 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.
The term pin-up refers to drawings, paintings, and photographs of semi-nude women and was first attested to in English in 1941. Images of pin-up girls were published in magazines and newspapers. They were also displayed on postcards, lithographs, and calendars. The counterpart of the pin-up girl is the male pin-up, also known as beefcake, including celebrated actors and athletes such as the actor James Dean, the singer Jim Morrison, and the model Fabio. Pin-up model sur Wikipédia (en)