I remember a thread I started about the Playboy Mansion rape scandal and some posters on here said the women working there as waitresses "had it coming".
Unfortunately many people won't consider getting raped in a party after allegedly flirting, dancing, drinking or being dressed in a sexy way a "legitimate rape", and unless a woman is dragged to the bushes by a complete stranger it won't be the accepted as legitimate rape to them. That for instance might kept some people from reporting it within 24 hours.
If you and others were to report a situation like that to the police I'm sure the lawyer of the of accused would right away start slut shaming.