When people speak about the sex trafficking market, experts say it not surprising to hear about places like Thailand, India, some European countries and even Mexico.
"It's like this underworld activity that most Americans just don't realize," Jenny Clark, associate professor at South Texas College in McAllen, said.
Spanish police have arrested 23 people suspected of trafficking Nigerian women into the country and forcing them into prostitution by using voodoo curses.
A senior United States government official claims underage girls are subjected to sex trafficking and migrants trapped into forced labour here, and describes New Zealand's way of defining human trafficking as "misplaced".
A recent investigation of 600 brothels by the Greman Federal Criminal Police uncovered at least 170 Nigerian women working illegally as prostitutes. Authorities determined that 50 of them were victims of human trafficking.
This is one of hundreds of highways throughout Europe where Nigeria's trafficking victims are forced to work. We could be in Barcelona or Madrid, Paris or Berlin, Glasgow or London. There are 100,000 trafficked Nigerians in Europe, and 80 per cent come from Edo – a southern state that is home to only three per cent of Nigeria's population.
Four people have been jailed for their role in the trafficking and sexual exploitation of an Eastern European woman brought into Kent.
Zsolt stands in front of St Stephen's basilica in Budapest's city centre every night from 8pm until the early hours. His job is to direct passing tourists towards a nearby "gentleman's club".
Editor’s note: Mira Sorvino, a human rights activist and Academy Award winning actress, went to Cambodia with the CNN Freedom Project to expose child sexual exploitation. This is an edited journal from her week in the country.
By Mira Sorvino, Special to CNN
Phnom Penh, Cambodia (CNN) – We have just landed in Phnom Penh, to begin one of the most important journeys I have ever embarked upon.
Kajsa Wahlberg remembers well the reaction when she helped lead efforts to introduce Sweden's now-famous laws criminalising the purchase of sex. "It had enormous interest. People were laughing in 1999 at Sweden and saying it can't be done.