Boys will be boys!
Of course things change. And yes, physically, labor and birth take a real toll that lasts for a few months. My wife had a couple of stitches down there as a result of our big-headed son:-)
As far as my wife being attractive, she was before she was pregnant, she was during the pregnancy, and she certainly still is.
With sex, it is not that we don't want to do it, it is more that we rarely have time to do it. And if it comes down to a choice between sex and sleep, I think for now we will pick sleep everytime.
But remember, after birth, sex will not be happening for a couple months, at least.