Edit: I wonder what smut the down voters have been downloading that may have given them the malwares. Reputable apps are fine. And there's no infestation. Just stahp.
And when it comes to e.g. games there isn't much of reputation information outside a very small set of hits. No need to download "smut".
Seriously, what is the point of saying that? There are lots of articles about the problem, but you stick to your own experiences then!