I have - several.... I actively seek out big guys (through personal ads, where I used to live on a phone ad, and here on AFF). I don't do that a LOT - with personal ads like that you have to wade through the fakes and possible psychos, plus the guys who are no longer interested in me when they find out I'm not built like a centerfold.
But, I've been with one guy from the phone ad, and two I met indirectly through AFF because of this.