>>1
Are you that same guy that is paranoid about installing flash, and openly admits to browsing the Web like it's still 1995 here? I don't know about viruses, but in my personal experience, I've never had problems from viewing videos on YouTube and RedTube. I don't like YouPorn's flash video player, so I never really go on that site.
I also have ABP installed so I don't have to worry about stupid video ads before the video plays (unless the ads are part of the actual video), and NoScript.