The term may also refer to a lifestyle based on personal, family, or social nudism. 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". People interested in social nudity can attend clothes-free beaches and other types of ad-hoc nudist events.