They cannot be found huddled under the sodium lamps of red-light districts. Young boys forced into prostitution are perceived not to exist. Faecal stains and blood mark the toilet walls, delineating territory. Many of the phone numbers are inked over by boys trying to see off rivals. Prices range from £5 to £20, depending on the 'trick' performed and the cost of drugs in whichever city the transaction is taking place.
