Sure their are.
But I think most guys actually like a little positive coaching, a lot of the fun is knowing your pleasing the one your with. If you frame your comments to him as "this is fun but what really turns me on is if you do this" I can't see how it wouldn't be a positive experiance for both of you.
In our experiance we have run into this often enough that we now include talk about what we like before we even get naked. Everyone has different preferences when having sex, for example, my wife and I are both normally pretty quiet during sex with each other (I think it goes back to having sex with others in the same house in our younger days), when we are with couples that are very vocal during sex they will often interpret our lack of vocal expression as a lack of interest. I've had women say in the height of passion "talk to me", I think, no problem, if that is what turns you on I can talk with the best of them (of course I sometimes tend to talk too much so I hear "would you please shut up and fuck me" a lot more often).
And because it is something I don't normally do, requests like this are usually exciting for me too. Variety and experiancing new things is one of the reasons we are doing this in the first place, after all.