Fucking with your timbs on is a very black thing to do. Watch any porno with a black guy and you'll see him fucknig with his timbs on. One, you get good grip out of it. There's no sliding on the bed sheets when you're digging your timbs into the bedsheets, smearing dirt and shit everywhere. Who cares? They shouldn't be your bed sheets anyway. Secondly, you can get the hell out of there quickly in case something goes wrong. I don't know what could go wrong, but I'd rather have options.
Now I have the image of Kanye having sex with Kim while wearing his timbs. I'm not saying I'm mad about that, but it is distracting. If you put a pen and paper in front of me I'd probably be doodling images of it.