In February, Europol issued a report investigating the state of human trafficking in the EU. The report shows that the trafficking of children and adults for the purpose of sexual exploitation increased between 2013 and 2014, and the situation is expected to become worse.
Sexual exploitation is the most reported form of trafficking in Europe. The mobility and rotation of trafficking victims are the key pillars of this criminal market. The Europol report names Austria as an important transit country, where many victims from Eastern Europe first find themselves after being taken from their own countries. Women and children are forced into prostitution there and then transferred further into other EU countries. It is estimated that 71% of all sex slaves in Europe, and 70% of the traffickers, are EU nationals, with the vast majority originating from Eastern Europe.
Italy, Spain and the United Kingdom are examples of transit countries for victims trafficked from other parts of the world.
You can read the whole report here