Mac viruses??

I know macs can get viruses, their just not as common as they are on PC's. What are some other ways to avoid viruses besides not browsing websites that are prone to have viruses (porn sites and such)?

Is there a anti-virus app I should purchase to decrease my chances of getting a virus?? Any input would be helpful. Thanks much!

You must have missed this sticky right at the top of this forum...

http://www.mac-forums.com/forums/sw...-official-antivirus-malware-firewall-faq.html