Men were required to avoid "semi-erections." If a man became aroused, he was instructed to turn over onto his stomach or enter the cold water immediately. Public displays of affection beyond a quick kiss were forbidden.
The concept of socially sanctioned nudity did not begin in the 1960s hippie movement. In fact, the "golden age" of nudism began in the late 1920s in Germany, with a philosophy known as Freikörperkultur (Free Body Culture). The movement was a reaction to industrialization. Proponents argued that shedding clothes meant shedding the rigid, unhealthy constraints of Victorian society. Vintage Nudist Camps
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