I understand that nudity in many cases can be used to support freedom of speech and equality of both genders and more of such, however there is so much pornography in today's music videos and so much sexualising in modern day music and music video that I think that some of it should be qualified under unnecessary pornography in music to help the artist realize that there was no need for it. For example Justin Bieber's new song What do you Mean. The music is okay, however in the music video, there was no need for him to have sex. It does not help prove any point what so ever. And I understand that this is an old argument, however, it is still a valid one. There are also young children under the age of 12 that are surfing youtube and when they see that this is trending they will obviously click it. Now I am also not a fan of complete censorship and I do believe that students and kids should be educated at the right age about their body and sex and all of that.
Well, all the arguments that you're saying are true : nudity in these videos can be unnecessary, kids can be shocked etc...But there is a big problem, the problem is that by definition an artist is free to do what he wants to do, it's called the freedom of expression. The artist is proposing something, and you're not obliged to buy it or like it. So that's why a draw line could not be drawn without having even a minimal degradation on the freedom expression. :)