You're lucky in this, in that I don't like reading things with explicit sexuality, so you can assume all of these to be worksafe; except, of course, if you're not allowed laughing your butt off at work. Some of them are like that.
For the PG-13 ones, I'm coding them by letters; HOW they're PG-13. A small letter is SLIGHT elements; a large letter is, well, stronger elements. This is because different things are offensive to different people; and someone who doesn't mind bad language might not want to read something with sexuality. That's cool, and I'm helping you out. V=violence. A=alcohol/drugs. S=sexuality. L=language.