When my daughters, now ages 22 and 25, were growing up, I knew better than to forbid them to do something. It’s the quickest way to make that forbidden activity all the more tempting. I find it interesting that Stephanie Meyer’s novel Twilight has an apple on its cover, the original forbidden fruit. Meyer’s four-novel series has captured the imaginations of the nation’s tween and teen girls, and, in many cases, their moms. It would be crazy for me to suggest we ask our daughters to not read the books or to not see the movies based on them. But I do want to suggest that we start being more...