Julia Rooke's film, Lover Boys, tells the story of Ibrahim, a Dutch-Moroccan social worker tackling the taboo matter of sex-trafficking within his community.
Below she examines the broader problem of internal trafficking.
Prostitution and sex-trafficking is a global issue that has operated in different forms for hundreds of years.
But one recent incarnation, particularly in Europe, is the grooming of young, vulnerable girls by men who befriend them, become their 'boyfriends' and then coerce them into prostitution.