Certain phrases/combinations can send you into a spam or safe search penalty. That is why. Think about it. Google has filtered adult sites (Safe Search) by phases or words right?
Wrong. No, Google has not filtered adult sites. WE choose to have them filtered out by setting our own preferences.
Adult sites do not equal spam sites, those are two different issues completely. There is no safe search penalty. Spam penalties, yes. Adult/safe search penalty, no.
Now, take that over to the search side.
No, let's not. It's wrong in the first place, so let's not take it anyplace.
The results of a person's own reasoning may or may not be the way things actually are. It all depends on the basis of their conclusions, whether or not the facts they're basing their assumptions on are correct or incorrect.