Wilson noticed the glow of the TV in the living room when he got up to go to the bathroom.
He already knew House wasn’t in their bed, but suspected he might have gone to the “just for show” bedroom to escape the alleged talking to his ex-wives that House claimed Wilson did in his sleep.
It wasn’t porn, at least not the strictest sense. Although for House, watching the NASA Channel feed of the Space Shuttle crew enjoying the freedom of weightlessness was essentially the same thing.
It was everything he longed for and something he could never have.