It's impossible to ever answer the question, because it really is the person viewing the photograph that needs to feel if the subject is erotic or pornographic, or offensive, or not.
For me the question is mute, I've seen blatant pornographic photographs that were both erotic and artistic and so-called erotic photos totally tacky and non-inspirational.
- is it a good photo? yes/no moving right along.....
This always comes down to the person's own moral standing/double standing. - It tingles, therefore I am...or.....it tingles, so it (and I) must burn and I need to repent my sins before god and my morally correct non-sexual, long gone, parents and grandparents.
It's like the freedom of speech; Who are to decide what's offensive in an opinion? If you allow this, why don't you allow that? Same thing.
And for the record; Galdonfi's work is simply awesome, regardless of the subject matter, really.