Ask her, or try saying things you want to say to her and see if she likes it. If you want to help her orgasm it's best to have her tell you or show you what will make it happen for her. Saying stuff in her ear might help, might not, ask her!

I don't think there are keywords that give a woman an orgasm.

what talking during sex does do is add to how sexy you are in her mind. Whispering, telling her how tight she is, or how hot she is, etc, works really good. And you don't have to be sweet about it. During sex, saying those "naughty" words is often very erotic.

Keep in mind, say something that makes sense. If you're feeling something sexy, say you're feeling it.

Agreed! Say what you are feeling...and be a lil "naughty" lol. My b/f doesnt say much, but when he does he gets a lil growl kind of..very animalistic, lol...it doesnt make me orgasm but it does help turn me on more. Everyone is different though.

My fiancee wouldn't say much either, but when he did he always seemed so surprised or... overwhelmed with my body, it was very sexy

I know exactly what you mean, it seems like that with my b/f too, he's very into me and my body, hehe

Why not choose a part of her body, any part, and then tell her why you love it? and then make your way along her body so you're communicating exactly how sexy you think she is, in every way and everywhere possible. Even places like her belly and arms, tell her all the good things about her body and she will feel very loved

If you want to make it dirtier, you could do the above and tell her what you want to do to it, ie suck/rub etc, or what you want her to do to you with it! Just a suggestion...