Once my wife said "this is your pussy" which was very random and maybe the only time she ever said it, I was fucking the shit out of her as hard as humanly possible and she came over and over before I pulled out and shot all over her face and neck.
I voted for "I'm gonna cum" which is the biggest turn on for me, when a woman says that, its lights out for me. I don't know why. I'm enamored with female orgasm. I find it to be the most amazing thing about the human body. Male orgasm too, but female orgasm, its so unreal how much of a woman's anatomy is actually involved in the physical process of orgasm.