Personally I don't think it's right for a man to have more screens connected to his computer than he has blades on his disposable razor...
Also, some men use a double-edged blade or a cut-throat (very rare), which means dual monitor setups already break your rule.
I seriously would not know what to do with the 6th. I can't use it for social networking or procrastination as I waste enough time already, and 2 screens for porn is just creepy. I mean everyone has their needs, but 2 screens is beyond need.
That 6th monitor is going to be creepy, no one will know what to do with it. It's just going to be blank and staring at you, making you feel shameful that you can't give it a dedicated task it can call its own!