I've never ran anti-virus, even when I was using Windows. I've always been very careful about what I downloaded, what I allow to get root permissions, backing u

I've never ran anti-virus, even when I was using Windows. I've always been very careful about what I downloaded, what I allow to get root permissions, backing up, etc. People always want to know why I haven't looked at their email attachments, and the response is always the same: no attachments, no exceptions! (Ok, I'm cool with images attachments.)