pin-up girl

Pin-up girl refers to the most sexually attractive star-actresses of an era, who would be popularized in seductive poses usually semi-clad in pictures, calendars, or mass-produced posters that were usually literally "pinned-up," usually with thumbtacks, on bedroom walls, the insides of lockers, and so forth. This practice started especially amongst GI servicemen away from home during military combat who pined for the "girl-back-home." Related terms for pin-up girl are "cover girl" (for magazine covers) or "cheesecake."