Well, I spent about an hour filling out forms on Google Search Console for malware sites. I clicked a couple of the links in the emails I got from Google alerts and was redirected to a site to install a browser add on. I then researched the site and found dozens of pages of how to uninstall the add on and clean up your computer that has probably been infected with malware.
So, not smut, but malware. But, Google does not make it easy to find how and where to report! I bookmarked the page this time.
It's really annoying, too, that I get at least one of these alerts every day. I guess it's better than being the site that they are installing the redirects on.