I think the answer is yes.
I have similar experiences - often it's my clean, quality sites dropping in traffic, and the crappy ones rising.
I think SEs simply don't care much about the adult sites. They don't really customize their algos for them, or monitor them closely to rank the quality sites high.
So when they introduce a ranking algo update created mainly for the mainstream sites, its effects on adult site ranks may be weird and random.
One of the overall effects I see is that image and text-based sites have a hard time competing with tubes in the adult SERPs.
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