Back when pool time was nude time.
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Nude swimming for men was a very common practice, and often required, at schools and YMCAs for much of the 20th Century. While the instructor is clothed in the first photo, often a male swim coach would be naked as well. In a men-only environment, swimsuits served no purpose, and students learned not to be ashamed of their bodies and accept their manhood in a positive way. Photos from the Life Magazine archives.