I don't think a person's previous behaviour should be a factor in a court case involving sexual assault.
The job of the defence counsel is to find any and all ways to discredit the victim, and 'past behaviour' is an easy signpost to use because it involves the human nature of jurors.
If you say to a group of twelve people that a woman has 'done this in the past ...' , then it sows the seed in their mind that she may have done it again here.
My point is that, no matter what a woman may or may not have done in her past, she is entitled to say 'No' to any and all sexual activity with whomever she chooses at any time.
I don't care if she enjoyed a pleasuable evening with the local rugby team the night before, 'No' means no, and that is the end of it.