In re: Jane Austen - while many of her books are romances, the extent of the romance is... conversation. At no point do the people in love kiss, or even touch suggestively. (I believe that Fanny, in Mansfield Park leans on Edmund's arm at one point, while on a walk, and Marianne in Sense and Sensibility is carried home by Willoughby after she sprains her ankle. I have read every last one of these books, and that's *it*.) They may dance together at public occasions. Girls are seldom alone with men, although they are permitted to receive proposals of marriage in private. Austen expends a lot of ink on the benefits of good manners and familial affection. The book with the most scandalous plotlines (Mansfield Park) is also the one that younger readers are most likely to get bored with. I would have no trouble giving them to a ten year-old - if her parents disapprove, I don't know what they *would* approve of.
Oh but you've forgotten Mr. Knightley drawing Emma's arm through his when he thinks he has to comfort her about Frank Churchill's defection, just before he proposes. Frissons!