I will admit I haven't read this whole thread. I also was a victim of rape. I am traumatized at the thought of being abused, tied up, raped. It is bad enough to relive the event in my head; I can't imagine acting it out.
I am far better than I used to be but I cannot be restrained during sex - the worst part is if for whatever reason my legs are pinned down. I still have nightmares.
I do not and did not have a victim look about me - but I do think that some men can sense any weakness in some women. Maybe that's the problem.
If this is enough of a problem to be concerned, I'd speak to someone about it.
My experience with rough sex has been what is sufficiently rough today may not be rough enough tomorrow. I'd find out the what/why now before this becomes a worse problem.