I could be mistaken but I feel folks are coming at this from a lot of different angles and aren't even defining words in the same terms.
Try this and see if it makes sense.
For whatever reason, and we don't no exactly why, the question was asked if a screenshot was suitable for WC.
There's a variety of answers, much reading into of answers things that were never proposed, some backtracking for the sake of harmony etc. I'm fairly sure that the majority of us will start off from the same point - is an image one we feel confident does not lessen the value of children in society (I can only speak in relation to my own British one).
I look at the shot and I have no trouble, as others have, in defining the shot as one which has an overall feel of WWII noseart as seen on Bombers etc - your basic sort of pin-up pose. I do have trouble though being able to say for 100% that the figure without a shadow of a doubt is supposed to represent someone that is over 16rs old.
I don't say it isn't intended to represent someone 16+ its just that the nature of the style defies an absolute interpretation.
Okay why does this matter to me. Well unlike Chas I haven't actually thought of the terms in which he is, while the concerns about how hentai can be used are valid - I placed the question in context of the already conflicting messages we seem to be unable to come to terms with or take responsibility for as adults.
I will assume that most people accept that there are conflicting signals that exist in Western society - many of them simply by natural default as a result of trying to define limits for entire populations.
So we have to learn to somehow live within these mixed messages and yet somehow steer a course that keeps children as safe and healthy as possible.
I know that women have worked hard to redefine themselves and their relationship with Society and that it follows that girls must also learn anew how to prepare for the expanded roles and I suppose we have to learn how to accomodate that safely. I know and support the movement to enshrine in law the respect and rights of children. I am not quite so comfortable with the seeming re-defining of children as young adults.
I wasn't really happy when I saw a documentary with children about 8yrs old talking to each other about their body mass index etc. Although I know and accept girls in particular are traditionally more self aware and experimental, the imperitives seem to have intensified and become more threatening to a healthy Society.
Getting nearer now 
We in Britain have a major catalogue store that tried a couple of years ago to sell a range of padded bras and thong sets aimed at an age range including 9yrs old. The link explains it more fully - I'm not sure how reputable the magazine is but from memory the article is pretty accurate.
http://www.weeklyworldnews.com/features/sex/40760
This to me seems a key event - I cannot for the life of me work out how and where the store got the message that this was how we as a Society wanted to start defining our 9yr old children, I am relieved to say that organisations such as Kidscape stepped in and the range was withdrawn. But someone, somewhere must have felt these were the messages society was giving. I can only assume that there are grey/undefined areas in which some people are seeing the opportunity for new markets and it is partly the allowing of mixed messages and a seeming inability to define what is reasonable today that is enabling this push.
Bringing it home now
I seem to be sensing that the present confusion in Society, the mixed messages, the consistent push to market increasingly adult ranges to increasingly younger children and the associative messages that is giving to children about how they should be perceiving themselves is beginning to cause an immense and increasing amount of distress, particularly as they go through their teens. I shan't fall back on statistics, they're unreliable at best I guess - but there does seem to be a recognised trend towards increased eating disorders, self harming etc. I recently attended the funeral of one young cousin who fell foul of feelings of loss of her own identity and threw herself off of a bridge. It wasn't a pleasant way to spend an afternoon.
So do I blame Boxxi for the destruction of our children nope and no-one has and for the record again I think it was in itself a well crafted drawing. No if you read the entire thread fairly you'll see no-one ever reproached Boxxi at all or even asked the image be removed. I myself provided a link - partly in order that people who wished the wall could obtain it from the source and in context.
I simply as an individual do what a previous poster has asked that we all do, I take full responsibility for my actions and don't look to others. I observe our Society and conclude that grey areas generally lead to pushing of barriers that go on to allow previously set limits to become the new grey areas. etc. So for me, as I cannot say for myself that I am 100% sure that the figure in the nose-art pose represents a clearly defined individual of 16+, I feel more comfortable when I choose to define it as a grey area and as such choose not to validate it.
In closing and for the record - I have 2 now grown up step-daughters, check my screenshot its been there for ages you will see I am not opposed to pin-up art. In fact I think that particular wall is titled ppp pick up a pin-up. I have absolutely no religion at all. I am ex Royal Navy (Radio Ops) so Hamburg, Lisbon etc are not a new concept to me and far from conservative when it comes to worrying about what consenting adults do in the privacy of their own homes, club or chandelier. On the other hand I have also worked for years with damaged, abused and disadvantaged young people and hate to see them placed in situations where they have to try and work out what the rules are for themselves as we as adults have chosen to abdicate our responsibilities. Particularly as increasing amounts of them seem to be failing to do so.
It didn't seem to reactionary a viewpoint.
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