There are occasions when dirty talk would have me stifling laughter not because of embarrassment but more because it seems ridiculous if you know what I mean ......and anything that is remotely ridiculous feeds my sense of humour.I either get embarrased or... start laughing..
Oh yeah you dirty girl etc.. instantly and i mean instantly.. turns me off!!
In terms of noise levels....Not overly vocal but does depend as others have said on how turned on I am and also how intense and orgasm is. (Looby)