The problem is, if your friend takes the pictures he owns the rights, especially if it is in a public place. If you delete him as a friend on Facebook, he can't tag you directly, but your other friends can tag you in his pictures.
Once the pictures are uploaded on Facebook, technically Facebook owns the rights. You can file a complaint through the website, but I highly doubt that anything will come of it unless the situation is serious (I mean like he is posting illegal material like kiddie porn or something).
I have the same problem with some of my friends tagging pictures I would rather not have the world see. Facebook sends me emails every time I am tagged, and I usually try to check it asap to see if it is something I want put up.
Good Luck!