Well, Conq, if you count they way they do, probably is. These people always have a broad definition of porn.

A video rental store that happens to have an adult room with hardcore porn in it is most likely counted as an adult bookstore. A liquor store that carries adult magazine is most likely counted as an adult bookstore. A Borders store that happens to carry Playboy, Penthouse, and some soft-core, late night Cinemax style movie is most likely counted as an adult bookstore. A public library that has a illustrated book on sex.... you get the idea.