The only time I’ve entered a “little booth” in public has been to take a knackered passport photo, get the morning after pill for free or confess my sins. These are all experiences with a touch of the abject about them, but I wouldn’t go as far as to call them “erotic”. In the late 20th century, though, “masturbation booths” were widespread across parts of Europe, Japan and America, offering a portal to pleasure at a time when pornography was much harder to access.
A “masturbation booth” is exactly what it sounds like: a private cubicle anyone can enter, lock from the inside and pay to watch a film of their choosing. They’re usually found on high streets, in train stations and red light districts, or installed as a “room” within a commercial space, like a sex shop. They became widespread after the legalisation of pornography in Denmark in 1967, beginning as a one-seater cinema for the purpose of watching a film alone. However, as time went on, groups of people would gather in them, and they became popular cruising locations in cities like Hamburg and Berlin.
Source:https://www.vice.com/en_uk/article/jgxbng/videokabine-masturbation-germany-klub-verboten