Umm I have BPD and I care for people with BPD (yes its a nuthouse

).
I think, sure maybe she is one of these highly sexually needy BPD, but it probably she see's you as "wanting" her sexually as validation.
I myself am much more emotional than sexual. And many of the BPD women I know can be very sexual, but in most cases I would say their emotional needs are greater.
I would guess, to her, she see's you having sex with her, as desiring her, as wanting her.
I am not sure I got that right.
The reverse could also be true, if she has seen herself as generally a sex object to men, and you are not focused on that, then the relationship could be on a different level to her.
Complex.