Harry Potter and the Deathly Hallows
As in all the Potter books, sex itself isn't really an issue, though this installment is somewhat more mature in content than its predecessors. While we saw some lightweight, rather drooly and comical make-out sessions in the last book, Harry Potter and the Half-Blood Prince, things get a teeny (get it, teen-y?) bit more hot and heavy here: there's a Harry-Ginny kiss that's more intense than anything Harry's ever felt before. However, it's also brief, and it's about all we get in the way of physicality in Book 7. OK, Ron and Hermione share a steamy kiss too. From start to finish, though, Rowling's series is still safe for the pre-high school crowd.