User blog comment:Rassilon of Old/Young Justice spoilers at Comic-Con 2012/@comment-4967138-20120912034015/@comment-5454370-20120912093720

right forgot about them... oh i know:

One day wolf was locked in the cave, the team and red tornado were all out on missions, naturally he need to use the bathroom. When superboy got back they decided to give him a designation so that computer could scan him as needed so he could exit and enter as needed by himself when no one is around. After that sphere got jealous so he got one too.

yep that's probably it. (or as good a reason as we'd ever get. so no need for AG questions about it for a serious response)