Yes, I've had similar experiences, but not netgear (nor for porn, it was that open socket blacklist... can't recall the name). Most likely, you're going to have to contact netgear directly. The problem, as you suggest, is that you have to stop the distribution at the source.
While I'm not familiar with netgear, there are a few of these 'oversight' databases out there. Here's one that gives me problems [webmasterworld.com].
I tracked it a bit further through users and the list is actually CyberNOT from CyberPatrol aka Microsystems, Inc. I have spent most of the morning tracking down a contact for them. I have an e-mail ( firstname.lastname@example.org ) and a URL www.cyberpatrol.com/forms/siterev.asp to submit for removal.
I told them my site is ICRA rated through RSAC as n0 s0 v0 l0. Since the meta tag is in the header I am surprised (and @#$%@#$% ticked) that the site is even listed. This is NOT the SE I wanted to be in.
Here is a tidbit from their Support DB: "Problem: LittleBrother is blocking sites that should not be blocked. Solution: There may be banner pages or links that force the user's machine to pull content from sites that are not denied lists. Details: At times it may appear that LittleBrother is blocking sites that should not be blocked. When a web page is accessed, it may force the user's machine to call other servers for data. Depending on the rules set, this may trigger a block. For example: www.yahoo.com has banners. While accessing yahoo.com, the html code may tell the user's machine to access a banner from monster.com. However, you are blocking job search sites. This will trigger a block."
This pretty much kills most advertising solution on the web. I am surprised CJ and LinkShare is not up in arms against this...