The quickest way to get a penalty is to link to a site that is either banned or under a penalty themselves. I believe that you don't necessarily get a penalty if there are a lot of crap links pointing to your site. I think google builds a backlink profile and if say you have a super high unusual amount of pr0 backlinks with irregular anchor tags they will apply a penalty. You can attempt to off set this with authoritative backlinks and bring your backlink ratios to a more normal ratio. I think there is some sort of tipping point where if too many of your backlinks look shady they drop your ranks. For example let's say you have 10k backlinks but only 100 of those backlinks have an anchor tag for your site title "Debauchery" google would send up a flag. Or if say all your backlinks say "free porn" or something. First thing I would do is thoroughly check your on site outgoing links for crap. Delete those guys. Then try to get a diverse backlink profile. Good Luck.
Also as a side note I have seen a lot of spammers ranking high for a lot of keywords that are clearly using a some sort of submission form spam bot.
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