In the 20th century, it was very common for boys to swim nude in the United States. Boys usually found rivers, ponds or lakes to swim in. If there were no girls or adults there, boys just took off their clothes to go swimming. In the United States, recreational (fun) nude swimming (but not school nude swimming) is often called skinny dipping. Boys didn't care if other boys saw them without clothing. Poor boys and farm boys did not even own a bathing suit. Some teenagers, usually boys, still go skinny dipping. It is most common outside of cities.