In the pecking order of dancer-stripper-prostitutes, the one who comes at midnight with another dancer to "put on a show" is more likely also a prostitute who expects to sell extra services upon arriving. These are not "pretty women." They're hardnosed, mean, cynical, and sometimes dangerous women who typically scheme and drug for a living.
There isn't anything about this case that suggests she was raped at the Duke house, except her word and an exam that may or may not bear up to cross-examination.
I bet these boys had some Penthouse fantasies about what these women would be like and ended up unpleasantly surprised at the reality.