A stag film (also blue movie or smoker) is a type of pornographic film produced secretly in the first two-thirds of the 20th century. Typically, stag films had certain traits. They were brief in duration (about 12 minutes at most), were silent, depicted explicit or graphic sexual behavior intended to appeal to men, and were produced clandestinely due to censorship laws. Stag films were screened for all-male audiences in fraternities or similar locations; observers offered a raucous collective response to the film, exchanging sexual banter and achieving sexual arousal. In Europe, stag films were often screened in brothels.