I'm assuming being incredibly vulgar in articles can lead to an article being flagged by safe search, yes? Outside of that, what about a semi-swear word like "damn"? If, for instance, I had a site called "damndirtyapps.com" but it wasn't about anything dirty at all, and was just a mobile app/game review site, would it be flagged for any reason? Would it be bad for SEO? Would it get indexed as normal? Just a thought that occurred to me, is all.
I am not entirely sure about this but I think it may backfire in some way. When we were using AdSense on our classifieds, users' ads containing bad/foul words would block AdSense ads from showing up. Also certain domain names would stop AdSense ads from showing. I know we are not talking about AdSense here, but still Google has put certain things in place where they are trying to protect the general population and their advertisers from anything containing vulgarity and I think it is true when it comes to domain names. You can try it though. Would be interesting to know if it will or will not have impact on SEO.