I kind of understand that they skipped the letter Q (though they did eXcellence with the letter X, so there is always a solution if you really look for it), but why did they skip the letter V? I mean the easiest option would be to use Vagina for that. Though not all the letters will get the word you may think it deserves or expect.
That being said the sort of documentary tries to break down many things. And I think it succeeds in many regards. That being said, you can not be squeamish or have issues or be offended easily. The movie (in its uncut form) does include quite explicit video of sexual interactions or whatever you would call it. Some would go as far as call it porn. The director obviously makes a distinction in his own mind ... funny he didn't mention the ommission of the letters - or maybe I missed it.
Anyway, this aged a bit, but can still be viewed for entertaining purposes and arousment for some I reckon (except the very harsh letter R - which only shows you, that the movie is not afraid to tackle such topics too)