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Nude swimming or skinny dipping is the practice of swimming naked, originally in natural bodies of water, but more recently in swimming pools or hot tubs. Most nude swimming today takes place on nude beaches, or at naturist facilities, and segregated public swimming areas or in private swimming pools. Most countries do not have specific laws regarding nude swimming, and the matter is regulated by social convention and practice. Some countries around the world strictly enforce social, religious and legal prohibitions against public nudity, including nude swimming.
The term "skinny dip" was first recorded in English in 1947 and is most commonly used in the United States.
Thomas Guidott set up practice in the English town of Bath in 1668. He became interested in the curative properties of the waters and he wrote A discourse of Bathe, and the hot waters there. Also, Some Enquiries into the Nature of the water in 1676. This brought the health-giving properties of the hot mineral waters to the attention of the aristocracy. Doctors and quacks set up further spa towns such as Harrogate, Bath, Matlock and Buxton soon after taking advantage of mineral water from chalybeate springs. Here cures were guaranteed by 'taking the water' or being 'dipped' by bathing attendant in cold water. Treatment was received in the nude. Until the 1670s nude female bathing in the spas was the normal and that after that restrictions were imposed. As time progressed the resorts had to address two questions; was it right that men and women bathed together, and was it right that clothes should be worn. Establishments sought to impose dress codes.
Each town was free to make its own laws, and some chose to. For example, the Bath Corporation official bathing dress code of 1737 prohibited men and women to swim nude either in the day or in the night. Bath's specific rules were prescribed as follows:
It is Ordered Established and Decreed by this Corporation that no Male person above the age of ten years shall at any time hereafter go into any Bath or Baths within this City by day or by night without a Pair of Drawers and a Waistcoat on their bodies. No Female person shall at any time hereafter go into a Bath or Baths within this City by day or by night without a decent Shift on their bodies.
Female bathing costumes were derived from those worn at Bath and other spas.
In the early 1730s fashionable sea bathing initially followed the inland health seeking tradition. At English resorts such as Scarborough and Whitby natural springs emerged from the cliffs allowing fresh water to be ingested and cold dip in the sea. The resorts modelled themselves on Bath, and provided promenades, circulating libraries and assembly rooms 
While sea bathing or dipping, men and boys were naked. Women and girls were encouraged to dip wearing loose clothing. Scarborough was the first resort to provide bathing machines for changing. Some men extended this to swimming in the sea and by 1736 it was seen at Brighton and Margate, and later at Deal Eastbourne and Portsmouth,  Seeing them frolicking in the sea attracted sightseers to the sea spa resort.
For the common folk, splashing in rivers and swimming was a leisure activity and always done naked by boys and men and often by the women and girls. Bathing in the sea by the lower classes was noted in Southampton by Thomas Gray in 1764, and in Exmouth by shoals of Exeter damsels in unsufferable undress in 1779. Lancashire working people bathed naked in the sea without any segregation in 1795:
lower classes of people of both sexes made an annual pilgrimage to Liverpool where they dabbled in the salt water for hours at each tide in promiscuous numbers and not much embarrassing themselves about appearance.
At the beginning of the Victorian period working people of both sexes bathed for pleasure without clothes. The genteel classes were bathing for health from using bathing machines, the men and boys swam naked while the girls and women dipped alongside them.  The rise of the influence of Christian Evangelicals caused arrangements for mixed bathing to be reassessed.
Moral pressures forced some town councils to establish zones for the women and men to bathe separately. A half-hearted attempt was made to suggest to men that torso-suits would be fashionable, but this was resisted by genteel swimmers who believed that torso-suits restricted the contact between the skin and the saltwater.
These areas were not policed, and around 1860-75, under pressure from the church ever stricter byelaws were passed but not enforced. Mixed bathing was a popular activity for families, who would take their custom to the next resort along the coast if mixed bathing was imposed. Resorts were trying to placate the Evangelicals without upsetting traditional bathers by designating separate ares of the beach.
Drawers, or caleçons as they were called, came into use in the 1860s. Even then there were many who protested against them and wanted to remain in the nude. Rev. Francis Kilvert, an English nude swimmer, described men's bathing suits coming into use in the 1870s as "a pair of very short red and white striped drawers". Excerpts from Kilvert's diary show the transition in the England of the 1870s from an acceptance of nude bathing to the acceptance of bathing suits. Kilvert describes
a delicious feeling of freedom in stripping in the open air and running down naked to the sea.
There are very few records of magistrates enforcing the byelaws. In 1895 Cosmopolitan reported that:
At most English resorts, buff bathing is available before eight o'clock in the morning 
In 1895 the Daily Telegraph, Standard, The Daily Graphic and the Daily Mail newspapers ran a campaign to reintroduce mixed bathing in all resorts, pointing out that its prohibition split up families and encouraged them to take their holidays abroad. Commercial pressure defeated the moral pressures. Sea bathing had ceased to be done for health reasons, and was done overwhelmingly for pleasure. As the segregated beaches in town disappeared, bathing costumes for men became part of the commercial package, and nude bathing ceased. Nude bathing continued to be practised outside resorts on isolated pieces of coast; a very few of these known beaches and coves later got local authority recognition as nude beaches.
The introduction of mixed bathing throughout Europe and elsewhere certainly created pressure towards bathing costumes being worn by both genders. However, well into the latter days of the Victorian Era, whereas all females were routinely wearing modest bathing attire, many boys well into their teens in Victorian England, even when in a mixed gender setting, were still swimming and playing at the beach resorts completely naked. An article published on August 23, 1891 in the Syracuse Sunday Herald suggests naked boys of up to 15 years in age were problematic for parents with daughters, and read:
A 'Bewildered American' writes to the London Standard that he can't take his little girl to play in the sand at a British seaside resort without her being surrounded by crowds of naked boys. An English friend told him that they let their daughters play with naked boys of ten years of age, but draw the line at fifteen.
All this was very much an English problem and one of attitude. In France discreet nude bathing for both sexes remained acceptable anywhere along the coast or on river banks apart from those in the town or village centres. In Germany, provision for nude swimming is made in major city centre parks such as the English Garden in Munich.
Among notable Americans, Benjamin Franklin, an avid swimmer, possessed a copy of The Art of Swimming by Melchisédech Thévenot, which featured illustrations of nude swimmers. American president John Quincy Adams was known to skinny-dip.
During the century, the woman's two piece suit became common—the two pieces being a gown from shoulder to knees plus a set of trousers with leggings going down to the ankles. In the Victorian era, popular beach resorts were commonly equipped with bathing machines designed to avoid the exposure of people in swimsuits, especially to people of the opposite sex.
Skinny dipping by young boys was common. The Dixon, Illinois Evening Telegraph published a request: for boys swimming in the mill race to be more modest as women felt they can't go down Water Street for fear of seeing them. In a 1909 New York elementary schools competition, boys in the 80 lb division competed naked. Woollen bathing suits were expensive and slowed down the swimmers.
The Young Mens Christian Association (YMCA) was set up in 1842 with a mission to provide an education programme and healthy sports to young men. The YMCA was responsible for providing swimming classes to countless numbers of American boys and teenagers. This included swimming in indoor pools. Swimming trunks were not permitted in their pools. In Lincoln, Nebraska in 1958, for example, learners were told just to bring a towel and not to bring trunks. In 1942 in Sheboygan, Wisconsin the Recreation Department reported that 404 youngsters had attended an 11 day swimming course where the boys were unhampered by bathing suits. When the YMCA began to admit females in the early 1960s, the wearing of bathing suits became a requirement.
In 1915 in Portland, Ohio all boys and girls wore torso swimming costumes and the pool was drained every 10 days. The problem was that woollen bathing suits were unhealthy and harboured the cholera bacteria and typhus bacteria which infected the water in the pool. Both the cholera and the typhus diseases could be fatal. As a precaution, the pool was completely drained every 10 days. In 1910 Sand filtration was introduced which reduced the number of bacteria present, but the safest way was not to wear woollen suits, and this approach was endorsed by the American Public Health Association (APHA). American high school and junior high school swimming in many states had policies that followed APHA guidelines. The guideline were published every three years, and from 1926 until 1962 every edition recommended nude swimming. In other states all boys and girls bathed in clothes. The 1937 Administration of Health and Physical Recreation training manual stated:
Girls were encouraged not to be athletic and were assumed to be more body conscious and allowed a simple unadorned undyed tank suit.
Chlorination was effective and difficult as the pH of the water had to be managed, and wrongly administered could cause burning of the skin. A simple test was devised in 1939 which made chlorination practical. World War 2 delayed its introduction until the early 1950s. Life magazine in 1951 had a large illustration of boys swimming together in the indoor pool of New Trier High School in Winnetka, Illinois, and the caption didn't mention they were naked. The practice continued in the states that had a tradition of nude swimming.
In some English schools, Manchester Grammar School for example, nude swimming was compulsory until the 1970s. It was discontinued when it started admitting girls. This was also the case for some American high schools. and junior high schools. and in some summer camps. John Towney in his 1937 article on Swimming and Lifesaving progams for summer camps wrote that boys and girls enjoy the thrill of swimming nude and costumes can be discarded for a night swim. A 2006 Roper poll showed that 25% of all American adults had been skinny dipping at least once, and that 74% believed nude swimming should be tolerated at accepted locations.
In the United States, states, counties and municipalities may enact their own dress codes, and many have. According to an Australian magazine, "In the early 1900s, women were expected to wear cumbersome dress and pantaloon combinations when swimming. In 1907, at the height of her popularity, Kellerman was arrested on Revere Beach, Massachusetts, for indecency - she was wearing one of her fitted one-piece costumes." In 1919, Ethelda Bleibtrey was arrested for nude swimming at the beach of Manhattan — she removed her stockings at a pool where it was forbidden to bare "the lower female extremities for public bathing." The subsequent public support for Bleibtrey led to the abandonment of stockings as a conventional element in women’s swimwear.
Nude swimming is fairly common in rural areas, where unexpected visitors are less likely. However, in some places even that type of swimming is forbidden by law. There is no federal law against nudity. Nude beaches, such as Baker Beach in San Francisco, operate within federal park lands in California. However, under a provision called concurrent jurisdiction, federal park rangers may enforce state and local laws, or invite local authorities to do so. Today, many swimmers in the United States confine nude swimming to private situations due to concerns about attitudes to public nudity.
Since the early 20th century the naturist movement has developed in western countries that seeks a return to non-sexual nakedness when swimming and during other appropriate activities. In some places around the world, nude beaches have been set aside for people who choose to engage in normal beach activities in the nude.
Today, most nude swimming takes place in private swimming pools, at a nude beach, at naturist facilities or at secluded or segregated public swimming areas. Some Western countries, such as Canada and the United Kingdom, have no laws prohibiting nude swimming in public areas, but some countries around the world strictly enforce various laws against public nudity, including nude swimming. Despite this, even some jurisdictions which maintain strict laws against public nudity, such as New York City, may turn a blind eye to incidents of skinny dipping depending on the circumstances, as police officers on the spot decline to make arrests.
Conflicts have arisen in the United States on Federally-designated beaches, which are nevertheless patrolled by local police, since there is no Federal law against nudity in these areas, but there may well be local ones. Skinny-dippers generally deal with this by keeping an eye out for local patrols, who generally do not go out of their way to find violators, as long as it is not flagrant.
Nude swimming was a common subject of Old Masters (painters from before the 1800s) and Romantic oil paintings, usually bucolic or in a mythological or historical settings. For example, Swedish painters Georg Pauli and Anders Zorn painted a number of nude swimming scenes. In later periods depictions of nude swimming scenes became rarer, but more likely to depict straightforward contemporary scenes. The cover of the August 19, 1911 edition of the Saturday Evening Post had a Leyendecker painting of three boys; the cover of the June 4, 1921 edition had Norman Rockwell's painting No Swimming, depicting boys in various states of undress escaping from the local authorities.
Several films have become notable in whole or in part due to their nude swimming scenes.
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