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Identified only as Mr Huang, the liquor maker was unable to keep up the illegal practice after customers noticed the unusual side-effect of drinking the spirits, which were marketed as 'nutritional healthy liquor', according to China News Agency.

Huang, who founded Nine Springs Ecological Agriculture Development Company in Hubei province, was said to have purchased 1kg of Sildenafil – marketed as Viagra and Revatio – on the internet in January and added it to his alcoholic beverages without mentioning it on the label.

Workplace warning: this video is full of manual stimulation.