OK, simple answer.
Pornography has no place in scouting the same as alcohol, illegal drugs and cigarettes.
HOWEVER, if the pornography in question is legal where you live and you are of legal age to view it and it does not violate your religious beliefs or morals, it does NOT conflict with the scout oath or law to view it on your own time. Now, there are probably not that many people in scouting who can truthfully claim that it doesn't violate at least one of those points, so the answers you get will tend to be skewed against it.