Wow, I come back here to find 90 more posts in this thread. I really didn't think this would be that big of a deal but I guess here we go...
1. I have never heard someone complain "wow i cant get naked in this game why would they block that"
You haven't talked to that many people that play mature rated games then. Plenty of people ask that question when playing games like Saint's Row 3 where they let you beat people to death with a giant dildo bat but apparently think actually showing nudity would be going too far.
2.Its a survival game. It was never intended to be funnny.
You don't know that. Sure it's a survival game but you can't know for sure that they never intended it to have any humor to it.
3.I dont think they are trying or are going to change the world by have penises in the game
No one even remotely suggested they were trying to change the world by having nudity in their game. Even the person you were responding to was simply stating that it gave them hope that the devs might try even more unusual things than just that.
Does nothing to improve or add to the game
It does nothing to detract from the game. Since you seem so insistent that the nudity requires justification then fine, i'll give you some.
First, it's only logical that if you are not currently wearing any clothing (the first "armor" you can make is just clothes) you should be naked. This is a fact that games shy away from all too often due to the worry they'll be given an adult only rating causing them to be treated like porn by our society. That's actually a sad state of affairs and does not serve as an argument for why nudity shouldn't be there.
Second, we don't know the intended backstory so for all you know it would fit perfectly into whatever story they may have planned for the game for you to start completely naked. When the only thing you have to go on for the setting are known placeholders intended to be removed from the game at a later date, you can't really say what the setting is intended to be or whether anything currently in it would fit that setting.
I do have to agree that it's a bit of a problem for Youtube purposes though. The people saying "they can just edit it out" apparently don't understand how things work on Youtube. Channels are a business and editing out nudity (especially when it's so common) is extra work for that business to produce the same content they can get from any other game.
It's hard enough for Indie titles to get coverage from Youtube channels without providing those channels the reason of not wanting to risk getting their videos flagged to avoid covering it. When someone has to make the choice of how to spend their next week making videos and it comes down to a popular new release (practically guaranteed high revenue stream) that requires no extra editing work on their part or an indie alpha product (a risk at best) that they have to do a lot of extra censoring work on, which do you think they'd pick?
I'm not saying that's a valid reason they should change it (I don't think they should) but it does mean Rust is likely to get significantly less free advertising from Youtube than they otherwise might have.