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The keywords show up for about a week and then dissappear only to be replaced by another set of "adult" keywords.
After a the first week my rankings for various keywords that are actually on my site have been falling from the first page of Google to the second (or from the second to the 3rd and 4th). Can there be a connection? Is this something I should worry about?
Well, I have one site -30 with some low quality links but I also have a dozen others rocking at the top. So as with everything google, keep guessing.
Right now you could bring down an internal page with a single "quality" off-topic link.
And an entire website with a bunch of off-topic or same-anchor links to its homepage. All you need to do is outmatch parameters - excluding relevance of course -, you don't need to outmatch quantity. How's that for a link profile change.
There's always a bigger fish, especially if you don't need to stay within the niche.
It's much easyer to find an off-topic source than doing actual link building.
Something needs to be done, and this time it's NOT The webmasters who'll fix it for Google.
They wanted control to be out of reach for us.
Well it is.