That may be true of goatse and even possibly autofellation. But a nude scene from a PG13 movie? I could not have guessed at the extreme reactions it has provoked from people. You have not demonstrated any fallacy.
It doesn't surprise me (although it doesn't offend me in the slightest personally). Still, I think people have a point here - there *are* concerns about nudity coming up where unexpected. In many cases, I think linking solves the problem fairly easily. In cases such as these, though, one has to wonder if the image is really that important. While it doesn't offend me in the last, in this particular case, I'm inclined to say no.
-- ambi