On what factual basis would there be any basis for liability? Did the host have any reason to know or suspect any such intentions by the offender? Hosts are not insurers against the consequences of their guests' bad conduct unless there is a reason that they should have foreseen that conduct or consequences. If someone comes to your house and commits a terrible crime on your front porch, should you be liable? Why?
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Generally, unless the host had some involvement in the criminal conduct, he or she would not be responsible. The woman who was assaulted needs to contact the police and report the incident as soon as possible.