"i have a pc with no virus protection or firewall up and i never get anything"
If you have no antivirus you will have nothing that indicates to you that you have a virus. I would put $100 on the table that if I scanned your machine right now I would find loads of spyware and virus's.
"there are already known viruses out there that attack mac os....that's the reason why Apple is no longer advocating that statement. They've also endorsed a few anti virus softwar"
I don't think that it correct, name one mac virus that caused any sort of wide spread damage? OSX is a inherently more secure system because of its unix (BSD) roots and how it manages users is considerably better.
Also
"Oh, alright, here we go again. First of all, 16% of computer users are unaffected by viruses and assorted malware because they use Apple Macs, not 4%. Wouldn't a hacker gain the greatest glory by creating the world's first virus for Mac OS X, instead of virus number 119,587 (or whatever it's up to today) for Windows? Why not collect the $500 prize for proof of the first Mac OS X virus? There are zero-percent (0%) of viruses for the Mac OS X platform that should, logically, have some 16% of the world's viruses if platforms' install bases dictated the numbers of viruses. The fact that Mac OS X has zero (0) viruses discounts "security via obscurity." There should be at least some Mac OS X viruses. There are none. The reason for this fact is not attributable solely to "obscurity," it's attributable to superior security design.
The reason why some desperately (or ignorantly) cling to the "Mac is secure because it's obscure" myth, is Stockholm Syndrome with a generous dollop of Cognitive Dissonance thrown in for good measure. It might make Windows sufferers feel better, but "Security Via Obscurity" is a myth. The continued repetition of the myth could also be borne of ignorance or a desire to spread fear, uncertainty, and doubt (FUD) to keep Windows users in the fold. Security concerns have become a major reason for people switching from Windows to Mac OS X. The New York Times' David Pogue explained all about Mac OS X's superior security versus Windows over two years ago when he admitted he'd fallen for the myth here.
Still not convinced? Try this one on for size: according to Apple, there are "close to 16 million Mac OS X users" in the world and there are still zero (0) viruses. For five years and counting. According to CNET, the Windows Vista Beta was released "to about 10,000 testers" at the time the first Windows Vista virus arrived. So much for the security via obscurity myth.
Could Mac OS X have vulnerablities? Of course, it could. Would Mac OS X ever inflict even a tiny percentage of the damage Windows' pervasive use has inflicted upon the world. No. Mac OS X is designed to protect the user. More info: Top 10 Mac Security Benefits (pdf)."