Nudism refers to a lifestyle based on the philosophy of living everyday life in the nude, treating nudity just as naturally as being clothed. In Japanese, it is also called "nakedism." In modern society, where wearing clothes is the norm, nudists aim to live freely in the nude within such social frameworks. With the spread of the internet, websites and message boards related to nudism began appearing in the late 1990s, serving as platforms for community interaction and activities. Among these, some clubs have deviated from the original ideals and instead focus on sexual activities, resulting in reported cases of covert filming. Nudist clubs provide an environment of freedom and uninhibited expression, offering a sense of openness that cannot be experienced elsewhere.