Like when you walk into someone's computer room and there's pictures of scantily clad/naked women on the wall, with Playboy magazines laying around, and some girl as the desktop background kind of weird.
If your going to be like that, then keep it private. Otherwise it's just straight up creepy.

Take your opinion and begone!
But seriously, I'll play the "if you don't like it, don't read it" card.

Pin up thread is over.