Let me get this straight. Are you complaining about games that... don't have adult content?
Well, for one thing they could have such content, just not in the screenshots or video, or near the beginning. And then, many tags are subjective. Even if we could go around deciding for creators how their own games should be classified, it would be a bad thing to do. We do encourage them to use appropriate tags, especially with regard to genre and tools used, but we can't and won't proactively police what they do.
Once again, if you have specific complaints about specific games, please report them and other staff members will take a look. Thank you.