(Several other people have mentioned this principle, but I felt it deserved its own sub-rule.)
In other words, is there porn of Disney characters? Ohhh, yes. Is there porn of characters from a particular Disney movie? Probably. Is there porn of this character from this movie performing this act with that character from that movie? Probably not - but you never know.
Me: "Has anyone done porn of Maximus and Svengetting it on?"
You: "No way - much too specific. Rule 34-S applies."
Me: "OMG, I just found some!"