If a film where Joan Baez used the F word was shown on TV in say 1963 - no one would really be too suprised if such words were censored.

In 2005 - where as been pointed out - there are other TV shows where such words (and simulations of the act referred to) can be broadcast - the censorship of our Joan's words can be thought to be surprising.

The big surprise to me is how this form of censorship in 2005 - appears to be so calmly accepted by the adult audience - the film in question was aimed at.