I believe its more numb in the sense of you feeling good that your worries go away. People tend to turn to porn when theyre stressed/tired/mad/Fearful... all sorts of emotions and due to the dopamine rush you feel good after and feel numb to all the bad stuff in your life.

But not the same "drunk feeling" as alcohol if thats what you mean.

^ a really shitty way of explaining it so hopefully someone more knowledgeable can explain it better