Is there a difference between acceptable and unacceptable pornography?

I just read a topic where a girl found disturbing porn searches from her boyfriends history, such as searches for women being abused. Some women on that topic were dismissing it saying that it was just fantasy and just porn. 
We know that child pornography is illegal and wrong, but where do we draw the line between "good" and "bad" porn? For example do you think porn that features adults pretending to be teens/underage, or porn that features "fake rape" or incest acceptable and normal? Please explain. 

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