Just imagine for a second you are at a friend's house playing a a game and your friend tells you this or even suggest the idea of using a game controller to jerk off. You would probably put the controller down and never play a game at your friends house again. For that reason alone you should never let your friend use that controller nor should you even suggest the idea to your friend.
It sounds like a good idea using a vibrating controller but it would be cheaper to go to a health/drug store or heck even a walmart and get one of those massagers for 15-20 dollars instead of using a 30-40 dollar game controller.