There is nothing wrong with if done the right way.This is 2014, times have changed.If it is related to the plot of the movie, which I have a hitch it does, then I don't see what Aamir has done wrong here.
And I certainly don't find it vulgar.Posing nude or semi nude in this case is not vulgar, rather the way in is done cane be so. The Poster rather sparks interest. Why and how is her like that.And going by the reaction, majority of the people didn't find it vulgar too.
Bollywood dishes out too many crap film every year.If you want to see vulgar, see no past then the horror-fest Humshakals and the like.Its Entertainment has a dialogue that goes like "You should marry a dog because a man turn to a dog after marriage too". Dis-respecting woman like in these two instances is what I find vulgar.Sorry for the rant.
PS: And Aamir is not nude in the poster.He is covering more than all those people wearing short under garments which we see in almost every other movie.
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