Vesterbro's main street, Istedgade, with its bars, clubs and sex shops, is noisy and brightly lit on a Saturday night. Groups of men, often unsteady on their feet from the effects of alcohol, prowl up and down. The women selling sex - most of them from Nigeria and Eastern Europe, their hair and make-up immaculate - are dressed in figure-hugging, comfy gym gear. They sport trainers you can run in - there are few pairs of high heels, and no stereotypical "sexy" outfits.

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