The first phrase I really love. It's so them. It makes me think of the scene in, I think it's "Field Trip," where Mulder is standing with his hand against the door frame and Scully just ducks underneath his arm to enter the apartment. It shows how comfortable they are around each other, touching in little ways like that.

The second phrase grabs me less. It reminds me a little bit of the scene from "Humbug" which ends up mocking his physical perfection. It's probably just me--I don't tend to find Calvin Klein ads all that hot. I'm weird that way.

On the broader question of quotes from fic, my experience is the same as yours. It's funny how lines from stories will just float into my head out of nowhere. There are certain ones that I find myself pondering from time to time without fail.