You asked: "What else ya got?"
My answer:
I've got more questions. Since you bring up the First Amendment: being on the owner's property after having been invited there, could they be denied the Free Speech right to say "No" to a sexual request, or any other request? And could they be denied the Liberty Right to leave?
I'll take the easy one first, which is your last question, the about being kidnapped. Put that way, which is a proper way to describe it, the answer presents itself.
Your first question is similar, but I'm not an attorney, so I wouldn't know the legal wrangling necessary to arrive at a legal reason that the person would have the God given right to say NO.
But they do have that right, and in this case I am sure it supersedes property rights.
I think these questions go back to whether the right to defend oneself supersede property rights. The right of a property owner to control what happens on his property?