Romania as one of the top five: According to this EU report: " Of the registered victims [of human trafficking] confirmed as EU citizens, the top 5 countries of citizenship are Bulgaria, Romania, the Netherlands, Hungary and Poland".

Source: http://ec.europa.eu/eurostat/documents/3888793/6648090/ks-tc-14-008-en-1.pdf/b0315d39-e7bd-4da5-8285-854f37bb8801

Most of the victims are female children (see same source as above p. 32)

In addition to extreme poverty in Romania there is this problem: "Romania’s response to trafficking, according to the Global Slavery Index, is among the worst in the EU."

Source: https://www.globalslaveryindex.org/

Here is a ten minute documentary on generational sex trafficking in Romania: https://www.linktv.org/shows/trust-docs/romanian-girls-trafficked-into-europes-sex-industry-for-generations

Like the girl in the above documentary, this woman was trafficked as a child from Romania to Switzerland. At gunpoint.
Source: http://www.bbc.com/news/uk-3762279

Additional source article: http://projects.aljazeera.com/2015/08/sex-trafficking-in-romania/

"Romania is a source, transit, and destination country for men, women, and children subjected to trafficking in persons, specifically conditions of forced labor and women and children in forced prostitution.Women and children from Romania are victims of forced prostitution in Italy, Spain, the Netherlands, the United Kingdom, Ireland [1] Greece, Germany, Cyprus, Austria, and France. Romanian men, women, and children are trafficked within the country for commercial sexual exploitation and forced labor, including forced begging and petty theft." Source: https://en.wikipedia.org/wiki/Human_trafficking_in_Romania

Clearly, a global problem.