Naturism , or nudism , is a cultural and political movement practicing, advocating, and defending personal and social nudity , most but not all of which takes place on private property. The term may also refer to a lifestyle based on personal, family, or social nudity. It may be practiced individually, within a family, socially, or in public. Additionally, there is also militant naturism, including campaigning, and extreme naturism is sometimes considered a separate category. Several other terms "social nudity", " public nudity ", " skinny dipping ", "sunning", and "clothes-free" have been proposed as alternative terms for naturism, but none has found the same widespread public acceptance as the older terms "naturism" and in much of the United States "nudism".