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A shirtless man has been filmed sneaking into a block of flats before performing a sex act in the hallway on every one of its 12 floors.
The images show the young man wearing just a pair of light coloured trousers as he makes his way up the building.
The incident was captured on CCTV cameras in the city of St Petersburg, in north-western Russia.
He can be seen looking around when he reaches each hallway to make sure nobody is there.