It's not really full on sex. I imagine a lot of kissing and petting. I wonder what she smells like, soap, detergent, and perfume she wears. I imagine like her lips, her skin is unbelievable smooth and soft. There is no unpleasant sticky friction, just smoth sliding of hands in backs, breasts, and butts. I would imagine her moans and whispers would be unrealistically musical. One reason I was into Kate so much was because, not only was she beautiful, but her voice and accent were a pleasure to hear.
I rarely ever think about oral sex. I don't think about her head between my legs, I do however think about what being between soft thighs would be like. When I do think about that kind of stimulation, I just figure it would just out legs intertwined. Me against those soft thighs, and he against mine. It is generally an after thought to everything else.
So yeah... Charlize Theron...