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If you look in your site referral logs, the content site URL will appear in the lengthy URL string.
The beginning of the URL is: [pagead2.googlesyndication.com...]
Find it in your logs then examine the entire URL - you will be able to see the URL of the exact content page that your click came from.
you can view the thread at [webmasterworld.com ]
While there are couple other issues for me as well, it is mostly and precisely for this particular reason that I currently refuse to use the content network. I simply do not trust what kind of sites my ads will appear on unless I can control it.