Movies certified Adult should not be censored at all. The ratings are meant to indicate the category under which the films are certified as U, UA, S, and A. And as long as you certify films, you need a certification board.

Why do we have censor board?

Film. The Central Board of Film Certification (CBFC), the regulatory film body of India, regularly orders directors to remove anything it deems offensive, including sex, nudity, violence or subjects considered politically subversive.

Is censorship necessary in India?

India is a very peculiar country and needs censorship because there are so many communities and religions that, if by chance, you hurt someone's sentiments, all hell will break loose. Films are censored but OTT content is not, so people tend to take advantage of it by adding unnecessary sex scenes and cuss words.