All you need for Kongregate is a username, password, dob, and email address. They won't send you any junk mail unless you leave the box checked, I promise, I've had a Kongregate account for just about ever now. As for Newgrounds, I assume it's the same, don't know though. I apologize for the inconvenience.
--
Indie game board: http://www.gamefaqs.com/boards/293-indie-gaming