In a world where men's "reasonable and honest belief" in consent encompasses successful defences like "I fell penis first into her vagina as she lay drunk and borderline unconscious on my floor", "I hadn't actually talked to her, let myself into the hotel room with a pass-key obtained by deception, asked my mate if I could 'have a go', and had sex with her from behind even though there were no indications that she even knew it was a different person having sex with her", "I only met her this evening, but I'm telling you that she said was into rough sex and I accidentally strangled her (and conveniently, since she is dead, she can't contest my version of events)" and "she was into rough sex so I used the knife under my pillow to accidentally sever both her jugular and carotid artery", you will have to excuse me if I think that actual, properly understood "reasonable and honest belief" is a million miles from the complete bullshit our legal system seems to accept as "reasonable and honest belief".
Men accused of rape seem to construct "reasonable and honest belief" out of the flimsiest of materials. And juries seem to buy it.
There is a fascinating chapter in Deborah Cameron's book "The Myth of Mars and Venus" where she carefully analyses and does a lit review of findings on the way men and women use language. It turns out that in all other walks of life (politely declining invitations to the pub, telling people they haven't been successful in a job application, critiquing work, writing reviews of things) men and women use language and non-verbal cues in exactly the same - with circumlocution, padding, caveats, all those things that make normal social interaction comfortable rather than too blunt for comfort. It is only in the sexual realm where suddenly popular culture and the law assume that men revert to some sort of animalistic set of tendencies where nothing short of screaming NO while punching them in the nose will enable them to understand that their advances are unwanted.
I wonder what your female acquaintance's experience actually felt like from her perspective. Or what her reasons for re-conceptualising her experience as rape were. It is, after all, not uncommon for women to repeatedly say no, then eventually (when it becomes apparent to them that there is no way of escaping the situation) lie there inert while the man "gets on with it", and initially tell themselves, as a psychological defence mechanism "oh, it was just bad sex, we all have bad sex sometimes". Only to realise months or even years later (perhaps when listening to a friend describe a similar experience, and realising that their outrage at her experience actually carries over into their own experience) that what they were subjected to was rape.