On the front page there is a "tester chat", which is more an anonymous chat on the front page versus an actual tester chat. While on other chat's, this chat is called the main chat. It's popular amongst people who are looking for cybersex. And this chat - the 99chat's chat - is known for it's SC (side chats) in which several people will swarm you with if you enter with a name that seems feminine or sexy (Kate or SexKitten).
Cassy: Okay, I'm also going on the main chat with the username Kat.
Samuel: Everyone in this chat, let's go to the main chat!