George...
Need to know which page/domain you are talking about to truly analyse it.
"Free Porn" as usual is a highly competitive keyword... and there are alot of new players competing..
You may have be devalued, because of lost back links, change in keyword structure of your page and a couple of other reasons..
"Penalties" as such.. are normally pretty clear.. as in if you are penaised.. you are gone from google.. not just "lowered/devalued"
As an anecdotal obsevation..... I often see things ranked well on Yahoo... then not rank well on Google
DD
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