Some of the girls who applied for a job at his social escort agency were as young as 15 years old.

A 17-year-old girl whom Chew had sex with went on to make about $20,000 for him in about a year.

The university undergraduate slept with about 50 men, charging them $400 to $1,000 each. As with his other girls, Chew took 40 per cent of her takings as his cut.

His other "social escorts" were not as lucrative, but Chew still earned $1.047 million from at least 19 prostitutes from 2007 until last year, when the law finally caught up with him.

He was arrested by the police at his Victoria Street office last December following a tip-off.

Yesterday, Chew, 38, who set up the now-defunct Prestige Talents Management, pleaded guilty in court to 28 charges, including living off the immoral earnings of prostitutes, having sex with a minor, having commercial sex with underage prostitutes, making obscene films and income tax offences.

Court papers said Chew, who has been married since 2002, started his vice business sometime in mid 2007 when he published advertisements in newspapers almost daily to recruit female social escorts.