A pin-up model known as a pin-up girl for a female and less commonly male pin-up for a male is a model whose mass-produced pictures see widespread appeal as part of popular culture. Pin-up models were variously glamour models , fashion models, or actresses. Pin-ups are intended for informal display, i. These pictures are also sometimes known as cheesecake photos. The term pin-up may refer to drawings, paintings, and other illustrations as well as photographs see the list of pin-up artists. The term was first attested to in English in [2] even though the practice is documented at least back to the s.