My take on it is this. It is absolutely developmental appropriate fro preteens and teens to care what people think, whether it is hair, clothes, or attitude. It isn't just cultural, it is how our brain is wired because it is what helps us learn and experiment with in our cultural norms, learn how to become functioning adults in our culture. Whether we like it or not, there are norms we all conform to in order to survive in our culture (even sub-culture like AP/natural family living has a culture to it) whether it be waxing hair or living in a community. So for me, I don't think it is sad that a tween, either boy or girl, would experiment with hair removal as self expression. Ultimately, from a developmental stand point, this sort of tween thing is a great way to learn about social pressure and how to deal with it on one's own so that when a child is faced with an actual life changing decisions they can handle it and hopeful make a great choice for themselves. As a parent, I would allow my dd to wax if I felt she had really thought about it, weighed the pros and cons. It is my job to guide her not make decisions for her.