Hmm....I can't claim to know what motivates women who want that sort of intensity level, but if you're as attentive as you say to their emotional well being, it seems that you would be aware if they were the sort who would be traumatized by what you do. Especially if you all have an open, honest dialogue before and after.
This story...jeez. I can't imagine being this woman and just getting contacted one day, by the guy who was never had to submit to any consequence for what he'd done. Just...still out there, living his life. Gah.
*shudder*
Not to mention the part where she'd never even been sure if she'd been gang raped or not, that night. How horrible.