In the episodes I've seen, there have not been any overtly sexual segements; as I mentioned, the language, situations and violence are definitely well beyond anything that children should be watching by any means.
Some of the language is very raunchy (and certainly implies "monicaness", to use the same term), and the violence is definitely over the top.
Any librarian who put that in the children's section needs to have his/her head examined.
The Japanese graphics are very good, I have to admit. I would post some of the content on my website so folks could see what I am upset about, but I am afraid it would be considered child pornography.