I sadly have to say that most of the fandom has been watching a "R-rated" program all along. TT^TTWe rate each series as a whole and are rating Hetalia as TV-MA because of some instances of profanity, crude humor and adult situations.
It has been a sad, sad day for me that people will be missing out to this great series.
But then again...Think Of The Children.
Also it's nice that it's going to be streamed on HULU. :D