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Making snide comments along the way about ART that we all know is art, and if those thumbnail pages would have been cluttered with THAT, we wouldn't be dealing with this now - eh?  Or do some people just not get that there is a difference?  Apparently not as I noted nobody responded with thier definition of porn.

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For the record:
por·nog·ra·phy     /pɔrˈnɒgrəfi/ Pronunciation Key - Show Spelled Pronunciation[pawr-nog-ruh-fee] Pronunciation Key - Show IPA Pronunciation–noun obscene writings, drawings, photographs, or the like, esp. those having little or no artistic merit. 

Don't take this wrong, but I love rants where people accuse others of things (like not defining pornography) and then proceeding to demonstrate that they can't do it either.

Your definition includes several terms, especially "obscene", that are purely subjective, depending on their time and place in order to say something falls in that category.

Now this isn't to say that I don't know porn when I see it:: given present North American standards and my own background I can tell when an image is porn or not, and I agree porn shouldn't be here.  That said this is not something that can be defined as black or white.

For instance, is a woman in a miniskirt and tight t-shirt, just standing there in a non sexually-suggestive pose, obscene and thus porn?  In fact, yes, it can be.  If you are a member of a social group or culture that sees any significant display of female skin as inappropriate the picture is obscene and designed to arouse.  Thus it is porn.

On the other hand you can have something which is meant to arouse sexually, involves nudity and the like, but is considered art today.  For instance in museums all around the world you can find art originating in India during the period when Tantric art was a common Hindu artistic and architectural motif.  It's all about the sex.  Yes, there's a religious aspect that the sex is for, but it's still about the sex.

Porn or not?  We think it's artistic today, but what would someone from another part of the world and another more repressed culture have thought at the time?  Obscene and not of artistic merit, surely.

As I said I'm not opposed to restricting porn in the galleries here.  But "porn" isn't a simple class of object that is easily defined.

Anyway, back to the thumbnail issue.  The solution (having a check for content for the thumbnail, thus allowing a person to filter their gallery that way, is the fairest solution all round.