No, but i do remember one of the options on the front page always being porn no matter what you searched. My middle school wanted us to use Yahoo search instead of google for pictures because it wouldn't show Rule 34 content.
I've been running a kind of long experiment over the years. I search the same word every now and then. Watching the top results change has been fascinating. It's gone from definitions to ads, and now it automatically tries to link into Google maps too. The original top results aren't even visible without scrolling anymore.