Why is it always Japan that has the strangest commercials and the weirdest TV shows?

Question:

Why is it always Japan that has the strangest commercials and the weirdest TV shows?
I'm talking about this; http://www.youtube.com/watch?v=0W8fBsLYHcE
And is it true that incest is legal there? Why?
Why are they doing this? There are childs too you know, why are they never thinking about them? It could harm their brains.

Answer:

Everyone has a wrong idea.

Incest IS legal in Japan. There is no legal punishment for having incest.

The only restriction is that they can't get married. Or it's illegal if one of them is under 18.

>Why are they doing this?

What is "this" you are talking about?