"pretty girls" thread attachments and copyrights

OK, i'm gonna be an *********:

a quick review of the "pretty girls" thread raises a question.

i notice more than a few post that have pics attached that "appear" on casual observation to be copyrighted.

more than a few of these post (with said attachments) were made by members that have been active in the "downloading" threads, and have taken the position that using someone else's work without permission is wrong.

stuffmagazine.com and tiffanylang.com are just 2 examples, and both sites have explicit notices regarding their copyrights.

i am curious if the use of those images were used with the copyright holder's permission or adhered to the owners T&C.