A man goes to a sheikh and says,

"Oh sheikh, I've been married for year and I have kids but in the past few years I've noticed I'm not attracted to my wife any longer."
The sheikh starts to ask him why? Has she gained any weight?
Man: No, she looks the same.

Sheikh: Did she get into an accident, did something deform her image?

Man: No, she looks the same.

So the sheikh asks "Do you have a hard time lowering your gaze when women walk past you? Do you have issues with pornography?"

Man: Yeah, how did you know about that?

Sheikh: "When you indulge in Haraam, when you fall in love with the Haraam, when you eat, sleep, and breathe in the Haraam, then the Halal becomes disgusting to you."