So, supposing someone needs to learn to drive and get the documentation to prove it, driving instructors could unite and say that they're opting out of currency and switching to sex as a form of payment. Thus, forcing people to turn into whores.
See, now this is what's gonna happen if you let a libertarian run things. People lose their inherent sense of dignity in the eyes of the state and the larger socio-structure.
Put your bonner away,this is only in the Netherlands. 
