This is interesting to me, historical semi nude portraits are okay but recent ones are not? So old things are accepting? What does age matter, I don't see it making that much of a difference in reality
As far as photos are concerned, age and "famous" do, indeed, matter. The "napalm girl" picture was banned for nudity - even when a head of state sent it out. Facebook said it would allow "historically important" works, but it still lies in a grey area. I highly doubt a new work of equal cultural importance could be posted today.