No sex, no nudity. An older teen girl is courted in an old-fashioned, chaste way by two guys. It's mentioned several times that the main characters, boys about age 9, dislike girls in general (this is a matter of habit and style, not a statement about sexual orientation).
A five-or-so year old girl treats an older boy as her servant and makes him kiss her, a split-second peck.
Violence & Gore
None
Some items are intentionally smashed, thrown out windows, etc. Otherwise just some pushing and shoving amongst friends.