Researchers and investigators are aware of underage girls who are prepared to have sex for 5 euros.
Belgium's People Trafficking unit, a federal police body, is on the case and possesses officers who are specialised in African prostitution networks.
Franz Manuel Vandelook: "Since as early as 1994 we've been busy fighting Nigerian people trafficking. After a quarter of a century we still see that very young girls are still being exploited for sex thousands of kilometres from their homes. This being said: we should not be desperate."