Former banker Juerg Buergin, was jailed for four months and three weeks on Wednesday for having commercial sex with a minor under 18 years old.

The 41-year-old married father of two was convicted of two charges on April 30 of having paid a 17-year-old social escort $600 and $650 for her sexual services at luxury hotels on Sept 29, 2010 and Jan 3, 2011.

He is the first man in the online vice ring case to have gone on trial.

Eighteen of 51 men have since been sentenced to between eight and 16 weeks, of which thirteen were given between 10 and 12 weeks' imprisonment after pleading guilty to having commercial sex with the same girl.

District Judge Eddy Tham felt that a sentence of five months would be appropriate.

But he reduced the sentence slightly after taking into consideration his period of remand of six days in total when he was first charged in court and last week when his bail was raised to $50,000 after he was found guilty.

The judge also said Buergin had not shown remorse and had not verified the age of the girl.

Since he had claimed trial he was not entitled to any sentencing discount accorded to those offenders who had pleaded guilty at the first opportunity,

Buergin, represented by Mr Selva K. Naidu, could have been jailed for up to seven years and/or fined on each charge.

Counsel said he had no instructions to appeal at the moment as his client had two weeks to consider.