I would consider valuing sex a real value change. Just as I would consider valuing heroin more than just a new source of pleasure. I used to smoke, and the quitting process has convinced me that it wasn't just another source of pleasure, it was a fundamental value shift.

I know this wasn't clear in my original comment, but my question was not entirely rhetorical. It was during the quitting ordeal that this thought first occurred to me, and occasionally I still puzzle over it. It is not obviously clear to me that I'm better off liking sex than I was back when I was a child and disinterested. And arguments to the contrary seem too much like rationalization.