The mods do fix it, but I think they are more likely to be around to fix it during the evenings. It's usually the people who are surfing at work who complain about the nudity flags not being checked. There are often very few mods around during the day.

I know just reading this forum that people forget to set the nudity flag a lot. I've done it myself. Heck, I remember at least one thread where the mod uploaded a naked Vicky, and forgot to check the nudity flag. If nudity is no big deal to you, you tend not to notice that these are nekkid pixels you're uploading, not clothed ones.