NEWSPEAK: "Sex-trade worker"

ORIGINAL MEANING: A policeman assigned to fight prostitution

NEW MEANING: Prostitute

It is not politically correct to use denigrating words for anything connected to sex behaviour. The word prostitute is too direct, too real, too embarrassing. 

The newspeak version gives you the impression of positive engagement, an occupation that deserves respect, unionized, with regulated wages, medical checkups, government assistance, government pension and unemployment benefits.