Negotiation is a method of bargaining with your assailant. A typical negotiation involves some type of agreement. For example, you give up your valuables to a mugger in return for not being harmed. This type of agreement is completely unenforceable. But it based on the logic that the mugger is primary interested in obtaining your valuables. Therefore, harming you doesn’t give him what he really wants. In fact, it may actually hinder him or increase his risk of physical injury or capture.
On the other hand, submitting to a rapist in return for not being further harmed is not based on logical reasoning. Since the rapist is really interested in you as the resource, your acquiescence doesn’t mean that he will not want to harm you further. He may or may not, but you have no say in the matter. In this case, the negotiation is very one-sided.
It is important to always keep in mind that you are negotiating with someone who is threatening you, someone who may intend to harm you. Someone who may not even see you as human. Therefore, you should not expect whatever an assailant says or promises is truthful. It is more likely he (or she) is manipulating you and preying upon your fears as a means to coerce you to do as he desires.