However, if you can say that it's censorship, like this author hints about Borders, you can possibly get some media attention out of it. Comparing your book to Judy Blume's doesn't hurt either. Banned in Boston still has a bit of a ring to it. You can probably get more kids to read the book because now they know some adult doesn't want them reading it. And because it's about S-E-X.
One problem is that Pop is a very generic title. Try typing it into the Amazon search engine and see what you come up with.