lol @ people thinking macs don't get viruses.mac viruses are just as common.
what do you need an anti-virus for
You need it for protection against viruses that will alter the working of the computer.
uhbut why would you let yourself get a virus in the first placeor use a system insecure enough to let programs do such things
Well... you know... things can unexpectedly happen.
I have avira but the ads dont bother me that much
I use Norton, works completely fine, does what it needs to do, doesn't freak out when stuff happens.
Only software I wouldn't use is McAfee.