Hello, what to think about this site?

http://www.pornoyoutube.org/

For sure is not "clean" what do you think him used to be first position in google for much much keyword???

i see him duplicated the domain and let google bad the other domain...
him link the duplicated page in his domain...

google so stupid to give so much relevance to his site just for this??? :yield:

Please, help me to understand his trick!

thank you.

So... nobody have ideas about how this site get so much traffic from google?