Warning: This story contains some offensive language

So-called spy-cam porn has existed in China for at least a decade, despite the fact that producing and distributing porn is illegal in the country.

But in the past couple of years the issue has become a regular talking point on social media, with people - particularly women - swapping tips on how to spot cameras as small as a pencil eraser. Some have even resorted to pitching tents inside hotel rooms to avoid being filmed.

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