наиболее уязвим оказывается секс-работник, который является заложником ситуации: нет документов, приехал нелегально, да что угодно. потому что легальный секс-работник в случае насилия может вызвать полицию.

https://en.wikipedia.org/wiki/Prostitution_in_Germany#Human_trafficking

victims are often unwilling to testify against their oppressors: the only incentive they have to do so is the permission to remain in the country until the end of the trial (with the hope of finding a husband during that time), rather than being deported immediately. Prostitutes from EU countries are not prohibited from traveling to and working in Germany. There is a large influx from Poland, Czech Republic, Bulgaria and Romania, for instance. Actually the income prospects for them are not larger than at home, but they prefer to work in the better and safer German environment, as long as they can avoid pimps exploiting and controlling them. German law enforcement aggressively tries to eradicate pimping. In one raid in 2013 near Bonn, 24 males were arrested for exploiting prostitutes, one of them just 15 years old.