Online searches for the Japanese clothing brand soared this week after the viral spread of the video apparently showing a young couple having sex in the Chinese capital's flagship store.
But the video also has drawn the concern of police and China's highest web regulator who are investigating whether it was a vulgar marketing gimmick.
The 71-second video shows a man filming himself with a woman in front of a mirror. A Uniqlo store announcement can be heard clearly in the background welcoming customers and advising them that fitting rooms are on the second and third floors while cashiers are on the first.
The online carnival is abating, however, now that the Cyberspace Administration of China has chastised two of the country's main Internet companies for allowing the video to go viral.
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It had been circulating mainly on Sina Corp's microblogging site and Tencent Holding Ltd's popular mobile message app.
The agency summoned senior management of the two companies for face-to-face reprimands yesterday, and today the video was difficult to find.
Meanwhile, many Beijingers have been taking selfies with the store in the background.