Forgot to say this before: Welcome! I'd recommend checking out the articles of the help and info section, since you're new around here, they tend to be very helpful regardless of your plans for being active in the community. To answer your questions:
1. Yes. There are multiple stories which fall on various points of the spectrum of squeaky clean to... Endmaster. "Top-notch" for us usually means "featured" or "top rated" and featured games are the games you see specifically displayed under the name of each storygame category. We do not have an 8/8 for maturity as the site does not allow anything quite that raunchy, but R-rated is 7/8. Off the top of my head, I can tell you that my first game is both featured and only PG-13. (There's some blood, very little language, and some dark humor.)
2. I have seen some. None of it was worth recommending. xD
Feel free to drop me a line if you need help with anything, and happy gaming~