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BBC Three's Stacey Dooley visits a karaoke bar in Cambodia, where girls as young as 16 are paid to sit and talk with men.

The UN estimates between 15,000 and 20,000 people are affected by commercial sexual exploitation in the Cambodian capital Phnom Penh, of whom 25% are children.

Sex Trafficking: Stacey Dooley Investigates is on BBC Three, Thursday 14 October, 2100 BST and afterwards on iPlayer.