Do you use any kind of security software?

Just wondering if the majority of people use some kind of security software on their Mac's. Either antivirus software or just using the firewall. There is no need to debate viruses/trojans and all that stuff. Just wondering if people use some kind of security software of if you just use your computers as is out of the box. I don't use any security software at this point, I just have my firewall turned on. I'm wondering if I'm in the minority or majority.