Magic Fingers.

You have something good. Don't screw it up. Bringing up the issue solves nothing, and risks much.

just cause he's good at something doesn't mean he's slept with hundreds of women. or practiced on numerous. according to my girlfriend I am extremely good at eating her out and she screams in pleasure when I do eat her out. I have only slept with one girl before her and a that was only once. everything I've learned about eating out is from watching porn and reading articles about what to do and how to do it. so don't think he's slept with tons of women just cause he can please you some guy study these things and just learn from seeing how its done.

Hundreds? I'd have a problem with being in a relationship with someone that has been with "hundreds" of others. Nothing wrong with sexual experience but when do you start to classify them as a man-whore?

I would be more likely to guess that he just pays attention to you. No matter how "experienced" someone is, you kind of have to start over with someone new, because the same things don't always work for everyone. There is no set formula. He's probably just good at learning what you like and what you don't. My boyfriend seems to think I'm great at everything I do with him, but I wasn't experienced at all; he was my first for pretty much everything. I've just learned to pay attention to what gets the best reactions from him.
So I wouldn't worry about it, just appreciate that he likes to please you :]