Enaturist -

The modern enaturist movement has its roots in the early 20th century, when a group of German intellectuals, led by Sigmund Kinsey's friend, Martha Heinrich, began promoting nudism as a way to improve physical and mental health. The movement gained popularity in the 1920s and 1930s, particularly in Europe and North America. Today, enaturism is practiced worldwide, with an estimated 30 million adherents.