One thing we all look at when choosing a new pad is how well it will entertain. With my current place I made certain that there was a bar counter between the kitchen and living area for easy drink service, and nice mood lighting throughout. This was all instinctual.
So why would I not want to bring a chick back to my place? For me the biggest reason is simple:
I have nice stuff.
Picture if you will this scenario: After picking up a chick at a bar I bring her back to my place. After she takes care of business I turn to her and say, "that was cool now get the hell out."
Chances are on her way out some of my stuff will end up less nice.
Now if I had taken her somewhere else my stuff stays nice.
Then there is the scenario described in the Beastie Boys song She's Crafty. (Self explanatory)
Now if you've been seeing a gal regularly, and finally decide to kick her to the curb you'll appreciate following this commandment. First of all there's none of her crap at your place to get rid of, and thus no nagging about her getting her stuff back. Second, if you were dropping her ass because she's crazy you wont have the psycho chick pounding on your door or making a scene on your front lawn. Finally, if you plan on dumping her like I suggest, she won't know where you house is to burn it down in revenge.
It is vitally important to follow this commandment if you don't follow the 5th Commandment: Never give a girl your number. Imagine that you've broken this commandment and you brought a girl back to your place. You're on the couch rounding the bases when your phone rings. Not to be one deterred by that, you continue on letting the answering machine earn its keep. After the beep you hear a girls voice saying "Hey Notregis, tonight was incredible, call me when you get back from delivering that baby." Yes that's right, your first date of the night has just called during your second date of the night. I have not met many girls who will admit that they enjoy this, in fact this is usually game over. (occasionally you'll come across a chick who will be angry that you didn't ask her to join in, when this happens promise to arrange a 3 way and start angling for the make-up sex) So unless the girls you date are freaks, if you have to break a commandment, never break 1 and 5 simultaneously.