1 Corinthians 10:6

Now these things were our examples, to the intent we should not lust after evil things, as they also lusted (KJV)

Then: Rather than considering "evil things" to be included in a five-part list, Thiselton (p. 731) sees this verse as an introduction to four temptations or problems (evils) Paul wants the Corinthians to beware. It is a general guideline with a specific purpose. It's purpose is exactly that - the intent, for the purpose that the Corinthians should not want, go after, desire or pursue anything obnoxious to the Lord. The next four verses are clarifiers so that the Corinthians have no excuse for not understanding.

Now: Today's believers can be just as obtuse and dense as the Corinthians. One sign on a road that there's a bridge out ahead is not enough. It sometimes takes four or five signs. Hopefully, the driver will control a wandering mind at the point where see at least one of them. And if someone sees all, then he/she may get the point. This is a serious problem. Point here: Don't do evil; don't even want to.

Extra source: The First Epistle to the Corinthians: a commentary on the Greek text by Anthony C. Thiselton (Authentic Media, c2000) online at 717http://books.google.com/books?id=IHG_DNLpmroC&dq=1st+Corinthian+commentaries&printsec=frontcover&source=in&hl=en&ei=W9fQSpC1GILplAfHiumoCg&sa=X&oi=book_result&ct=result&resnum=11&ved=0CB8Q6AEwCg#v=onepage&q=&f=false