A stag reel or stag party film is an erotic, often explicitly pornographic, film reel produced from the 1900s to the early 1980s. The term stag refers to single men ("to go stag" = "to go alone"). Some pornographic shorts made in the 1930s even had a fictitious "Stag Films" company logo showing the head of a male deer. These "blue movies" were originally shown in brothels, fraternal organizations and social clubs, private all-male parties (especially bachelor parties), as well as "members only" cinema clubs.
Stag reels (aka film-loops) were initially highly illicit and nearly always produced anonymously for fear of legal prosecution. These "nudies" were primarily clandestine 8mm and 16mm silent, single-reel short films (5 to 15 minutes in length) made for private viewing and sold under the counter at adult book shops.
By the early 1950s, nonpornographic reels featuring nudism, striptease acts, and various fetishes (bondage, spanking, role-play, etc.), were being sold through mail order ads placed in mainstream girlie publications and underground fetish/spanking magazines (Bizarre, Corporal, et al.). Cheap film projectors and hand-held viewers were also sold through men's magazines. (In the late 1960s an 8mm fetish reel (200 feet in length) sold for around $20-$25.)
Fetish-oriented reels generally did not contain sex acts (or even nudity in many cases) while pornographic sex reels did not include fetishistic content. (Some films produced in France starting in the 1930s are the exception.) By the seventies, color films, some with audio music tracks, were introduced as the line between hardcore pornography and non-sex fetish reels began to blur.
Stag reels produced on film became obsolete in the early eighties with the introduction of the videocassette and VCR home-viewing technology. Many of the earliest bondage/spanking videotapes were compilations of silent 8mm stag reels converted to Beta/VHS format, often with public domain music added to the soundtrack.
The earliest stag reels with fetish and BDSM sexuality come primarily from France in the 1930s (later, other countries followed). Several Paris-produced spanking/whipping reels still exist, including some by erotic/fetish photographer Jacques Biederer (photo above)
Since this page is just a small side project don't expect a large collection stag movies. I did however try to bring together a nice collection movies that reveal some fetish themes. Some are stag movies, others are hollywood movies with spanking or fetish subjects presented in the movie.