No, I don't want to DO any given gentleman with the largest dildo possible. On the contrary, I want to give a gentleman whatever experience is most fun for him. This thread just happens to be about large ones.
I chase the more intense orgasms more than I chase stretching people for size. I'm more inclined to work a prostate and make someone thrash their whole body going crazy over the insane orgasm they're having for like an entire 20 seconds, than to focus on stretching someone's asshole bigger and bigger to try to get them open for my largest toys. Of my own accord.
That said, when someone is enthusiastic about the large toys, I do think it's so much fun! Novelty factor, for one thing... being able to get fucked by large toys is a SKILL and I am IMPRESSED by how much some of these guys can handle. Also, guys whose asses are extremely hungry in general turn me on. Guys who love large toys tend to be super enthusiastic about it, and it gets me throbbing and wet. Plus of course it's super fun to watch someone swallow a giant strap-on over and over. My favorite is fucking someone with a giant dildo when he's in a hanging sling. Of course I can't tour with one, so this is a rare treat that I only get when someone enthusiastic about giant dildo-fucking has me over...
I will say that I do have a special fondness for guys who like to receive anal fisting. There's something very special about being able to have my entire arm inside of someone, feel his heart beat through his body, etc. Also very impressive to watch someone take that much of my body inside of his!