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 models, actresses, and fashion models whose pictures are intended for informal, aesthetic display, such as being pinned onto a wall. Beginning in the 1940s, pictures of pin-up girls were also known as cheesecake in the U.S.

Glamor photography is a genre of photography in which the subjects are portrayed in erotic poses ranging from fully clothed to nude. The term may be a euphemism for erotic photography. For glamour models, body shape and size are directly related to success. This type of photography is also known as "cheesecake" or "pin-up" for women and "beefcake" for men.