Songbird
She rules her life like a bird in flight
I certainly would have given permission if that's what my daughter wanted to do. I was out of the house and living on my own at 17, traveling through Europe alone at 18. 16 is not too young to make and take responsibility for your own choices. Even for a younger person, it isn't the nudity that would put me off, but the context. For example, if the scene involved any kind of groping or other age-inappropriate behavior I'd say no.
I appreciate your view and understand it. But I strongly disagree. Many kids are mature enough to handle it, but movies aren't just about the actor's maturity. The consumption of the movie is more the issue to me. I think arbitrary age laws keep sexual pressure off of kids, especially those whose frontal lobes need a little more time to develop. Of course teens are sexual. But American culture specifically isn't ready to sanction sexuality for them. Educate them, allow them choices, guide them, but please, Hollywood, don't send the message that sexuality between kids and adults is normative.