The California native often schedules his trips for November, the month when Cambodians celebrate the Bonn Om Teuk water festival, marking the end of the rainy season.

"The whole country comes together for boat races. Hundreds of thousands of people descend on the waterfront and it's filled with colors and flags," said Cohen. "You know my thoughts about the water festival always include Jonty, because she and her sister would get a day pass during the festival."

There was a smile on his face when he started the sentence, but by the time he had finished, it was gone.

Abolishing slavery

Cohen is a human rights advocate. He founded a charity called AbolishSlavery.org last year, but his work freeing victims of human trafficking began more than a decade ago.

His trips have taken him around the world, from Sudan to Nicaragua to Israel. But, he says, in Southeast Asia the problem is especially bad.

"I would rank Cambodia right up there with India as one of the worst places in the world for sex-trafficking."

A bad problem getting worse

According to the NGO, End Child Prostitution, Abuse and Trafficking (ECPAT), as many as one-third of all sex workers in Cambodia are children. Government entities, including the U.S. State Department, are pressuring countries like Cambodia to do more to stop the modern-day slavery epidemic.

"We are making major strides in the fight against human trafficking. But it is a major problem, we know that," said Ambassador-at-Large Luis CdeBaca, who leads the State Department's Office to Monitor and Combat Trafficking in Persons. "You have estimates as to the number of people in servitude worldwide and it's anywhere from 12.3 million on the low end as cited by UN's International Labour Organization -- to as many as 27 million people on the high end. That's a number coming from the research done by (the aid organization) Free the Slaves. But 12.3 million is a baseline number that everybody agrees that there are at least that many people in forced labor, and that's far too many."

In its comprehensive 2009 Trafficking in Persons Report, the State Department put Cambodia on its Tier 2 Watch List. The ranking means the Cambodian government does not fully comply with the minimum standards for the elimination of trafficking, but is making an effort to do so.

"[In Cambodia] the number of victims is increasing and the number of prosecutions has gone down from the previous year," says CdeBaca. "The report shows that despite the overall effort, the government has not shown enough progress in convicting and punishing human trafficking offenders or protecting trafficking victims."

Cambodia is categorized as a destination country for foreign child sex tourists, with increasing reports of Asian men traveling to Cambodia in order to have sex with underage virgin girls. The State Department report states a significant proportion of trafficking victims in Cambodia are ethnic Vietnamese women and girls who are forced into prostitution in brothels and karaoke bars.

A chance encounter

Jonty Thern's short life could be a case study for that assessment. Jonty's family immigrated to Cambodia from Vietnam shortly after the Vietnam War.

Faced with gripping poverty and a debt, Jonty's mother sold her daughter, who was 10-years-old at the time, to a person on Cambodia's border with Thailand.

There, the mother was told, Jonty would sell flowers and candy to customers in bars and nightclubs. It was only later the mother says, she would learn that while there, Jonty would be repeatedly raped and beaten.

After three years of physical and sexual abuse, Jonty was released by her captors and allowed to return home to Battambang. Soon after, she and her sister willingly went to work at a karaoke bar to help the family pay off their debt, according to her parents.

The scenario in which Cohen describes meeting Jonty Thern, then 13-years-old, is as appalling as it is prevalent.

"I was working as an undercover sex vice," Cohen said. "I was posing as a sex tourist, going from karaoke bar to karaoke bar, massage parlor to massage parlor, looking for underage workers, to see if I could get them on camera soliciting me for sex."

As evidenced in the State Department report, it is a poorly-kept secret in Cambodia that many of these establishments are also operating brothels.

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