Its quite easy to stumble upon dodgy search results without trying. Watersports for example often comes up with search results that are nothing to do with what I am looking for. Paddles.net used to be a spanking fetish site (I was looking for a kayak magazine when I discovered that).

An ex-collegue said he attended a talk where they explained that images are often hidden under layers in a word document. You may be unaware that you have illegal on your machine.

Again, we're not talking about something that happened by accident, or about sexual interests which are somewhat abstruse but entirely lawful to pursue. I'm not sure what you imagine it adds to the discussion to raise points that aren't germane to the matter at hand. But perhaps they are and I merely fail to see how. Perhaps you'll elucidate the connection.