Characters
I generally don’t like discussing kink on an empty stomach.
— Justin • Queer as Folk

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker says they generally avoid talking about kink when hungry. The joke sets a sexual topic beside an ordinary need for food, treating frank discussion as something best done after a meal. The dry politeness keeps the subject openly sexual while framing it as a matter of etiquette.
Context reviewed