According to the defense, there was no evidence she had even had sex.
Hospital employees who examined her wrote that her injuries were consistent with rape trauma. There is evidence that she got cuts and bruises to her legs before she got to the party, and I wonder if she might have had been physically abused or had "rough sex" with her "boyfriend" or a paying customer. Perhaps she was so drunk she had already fallen down several times. With that in mind, I would have to believe that private investigators are combing the streets to learn who are the other assignments or customers she had contact with that day, as possible witnesses or suspects, and to determine who she was drinking with and who took her to the party. Since she showed up near midnight already possibly intoxicated and injured at the frat party, how many other assignments, or "customers" had she already seen that day? These people definitely need to be interviewed. And because of the nature of the case, the police should be taking the lead to try to locate these people, to rule them in or out as suspects.
The defendants' attorneys have been saying that there was no DNA evidence that she had had sex at all, at least, with any other person, within the given time frame.