Perhaps BBC producers should watch some of Douglas Murray's finest moments on YouTube, and have a quick word with some of his former colleagues, before they next invite the Spectator's neocon-in-chief onto their shows to fill the 'mainstream, centre-right pundit' spot. Murray is far from mainstream and far from centre-right.
In short, the PM is making it a crime to have certain, warped sexual fantasies, to get excited, in your head, by things that the vast majority of us find disgusting. He's making the enjoyment of certain fantasy images and fantasy words into a thoughtcrime.