Well you should be able to verify the validity of this claim since it is referenced in the article. Facts are facts and this one should be easy to validate or discount.
Also, these "shops" are usually all clumped together in one section of town and you won't see them next to each and every McDonalds. At least thats the way it is where I live.
I was using the highway exit as an example.
There are 5 McDonalds in my area and not ONE porno shop.
According to his caculations we should have 15 porno shops in my area.