Gaming Nexus has a piece on using the Xbox 'S' controller as a chick magnet:

Dont try to get your woman into HALO by throwing that massive Xbox standard controller at her, but at the same time dont patronize her. You have to take her feelings into account in this situation. Sure, you may have become accustomed to your one and only Xbox S controller but relinquishing control of your gamepad does a number of things. First it shows your care for her as youre willing to sacrifice your favorite piece of equipment, probably a sacrifice youre not willing to make for your other buddies. It also makes gaming much easier for her to begin with. People often assess whether or not theyll enjoy something by referring back to their first memory. So lets say youre a dumbass and you do give her the big Xbox controller. In short time her arms may tire, she may not be able to function the triggers properly or the face buttons might stick on her. Youve already ruined the experience for her and she might not want to go back. Try your best to accommodate her and youll have her killing those bastards in no time.

I don't know... personally, I have one 'S' controller and I don't even use it myself; I've just gotten too used to the standard one. And as for my girlfriend? Well, she plays Halo too, but she also likes the big one. I guess it's just personal preference.Thanks to Nick who pointed this out in the HBO forum.