Censorship, not really...its just they don't want people at the event getting naked...Just like car shows, just have them dress sexy, but not slutty... IMO, clothes leave something to the imagination anyway...
BTW, DD or anyone else who has been to E3 do you have any tips for getting in with being part of a small net company or website? Some co-workers and I really want to go to E3 this May and are trying to figure out the cheapest way to get around their requirements...