Unacceptable behaviour also includes eating picnic style lunches outdoors,dangling feet in the canals and wearing tight fitting shorts on males.
The man behind the clampdown is Augusto Salvadori, the tourism councillor, a veteran of the struggle to protect the dignity of the city who 20 years ago waged war against gondoliers singing Neapolitan songs to protect ''the dignity of the city''
The focus of his crusade is what Venetians now call torsonudismo, literally ''torso-nudism'' practised by tourists removing their shirts in the heat.
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