Sex advice books from yesteryear are always fun. I think the old fashioned language used is interesting and probably dates a book more than the information contained. I think petting as a term was out of fashioned by the 1970s. Petting was a term my mother used.
Otherwise, some advice includes moving on to another “activity” when the urges become too much. (I would imagine some clarification on “another activity” is probably a good idea.) You can also buy the young lady a present. (I am not quite sure how a present works in this scenario.)
Regardless of one’s personal beliefs, I cannot imagine this book being much help to our modern teens, Christian or otherwise.