Well, I actually never get bored over porn itself, even though it's always the same and nothing new for long, long years. But since I'm more focussed in seeing guys performing which I like, I'm sometimes a bit frustrated when I can't find any faces I like (or the body doesn't match to the face). That's when I pull out some of my old time favs to watch until I see someone new and exciting. I've probably seen most of my favs a hundred times or more, but they still kinda work because they feature my kind of guys.