For myself, I guess I'm a little complicated. I prefer third person, but also love the challenge of getting into the head of the character being abused not by directly writing down the characters thoughts, but rather by being detailed about how others see her reacting, by noting small details such as where she's looking, what her posture is, what her physical sensations are.

For some reason I find that to be more erotic than just a straightforward "Here's word for word what's in my head." Letting the reader infer what in a characters head by her reactions and her immediate environment tends to be more satisfying, in my experience.