Do I need to use a virus protection service such as McAfee with my Macbook Pro?

I would like to know if I need to use a virus protection service such as McAfee with my Macbook Pro. I understand Macs do not get viruses - is this correct?

McAfee has caused numerous problems for Mac users. This is the results of a forum search I just did.
https://discussions.apple.com/community/mac_os/search.jspa?peopleEnabled=true&us erID=&containerType=&container=&spotlight=true&q=McAfee
Macs are not vulnerable to a virus but they are malware.
http://www.reedcorner.net/guides/macvirus/
How to avoid or remove Mac Defender malware

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