Noun
English Wikipedia has an article on:consensual crimeWikipedia
consensual crime (plural consensual crimes)
An activity to which all participants consent which is deemed to be illegal.
Drugs, gambling, and prostitution are the Big Three underground 'moneymakers' in consensual crime. There would be, however, significant boosts to the economy if the stigma attached to the other consensual crimes were eliminated through legalization. Peter McWilliams