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What is this fallacy: two things have one (or few) thing(s) in common and you expect them to be the same?

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Original Question
I heard it this morning,

A man claims that pornography is art for two reasons.
1. Leonardo made naked statues / Porn has naked people
2. People pay to see them / People pay to see porn
3. Leonardo made art, and porn has two of the same characteristics.
3. Therefore porn is art.

I would argue that porn is not art, for several reasons. Despite the fact that these few
things are common, it does not make the two equal.

Another example would be:

"Both milk and urine are simply fluids from animals".
The claim is true, but it does not justify you to put urine and milk to the same category.
-> The other one is meant for nourishment, the other one for garbage (C.S.Lewis).

What is this fallacy? (one thing in common, does not mean two things are the same)



Answers

2
The problem I see here is not only the content fallacy per se but also the lack of definition for both "art" and "pornography". Only after we clearly defined the concepts - by specifying the necessary and sufficient conditions (upon which we agree) - we can evaluate arguments of this kind.

In my view, the argument (aside from committing the bad analogy fallacy) contains the some/all confusion . Is all/some pornography art?
Well I know there is a thing called false analogy fallacy. But as far as the art moniker. Lets put it this way. I went to an art exhibit and "competition" in Miami Fla. In the late 80s. First place was a mannequin painter painting a wall and it had splattered paint on the figure, the wall, and drop cloth. Second place was an actual Dali inspired type "melting" figures in nature oil painting. A brilliant work actually reflective of artistic talent. Third place was, and I kid you not, a Campbell's soup can in a large zip lock bag hanging on the wall. It was selling for 3000 bucks. Oh the can was dented if that matters and I'm pretty sure there wasn't a Warhol signature anywhere. So, basically I decided from that moment on everything is apparently art....lol
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