You must have an awfully good filter on your computer! Before I set my spam filter to HIGH (with Earthlink) I was innundated with unwanted images in my inbox. It saddens me to no end to realize that children have seen those same images and been mentally raped--- had their innocence stolen. If this doesn't bother you (not you specifically, BearCub---anyone reading this), then you are too far gone.
I use a free program called SpamBayes. It integrates with Microsoft Outlook and kills 99.9% of the spam I used to get daily. Every day more than 150 spam emails hit my inbox.
Personally, I have more problem with spam in general than I do with porn specifically. I think spamming should be a jailable offense.
I'd love to know what you guys are doing differently than I'm doing. I don't even use spam filters, and I never get obscene spam, or any spam for that matter.