Boobage starts at 1:20.
YouTube isn't the place to go for boobs, at least not uncovered boobs. Generally, any video on the site with a female nipple gets taken down pretty quickly, and often the uploader's account is deleted.
If you happen to post videos that rack up millions upon millions of hits (and ads), then YouTube seems to be okay with it. Example A: Lady Gaga flashes her ta-tas to her army of Monsters in a goofy and grainy video. Don't expect her account to be deleted, though. That's just the way the world works, kids.