In the case of sex, it is an action that is legal(or not) depending on consent.<p>In the example I gave earlier, the female has obtained consent from her partner. The male changes his mind half-way through but does not stop or act in any different way.<p>In cases such as these, my understanding(and gut feeling really) is that since knowledge of consent is what makes an action legal, the person had no knowledge consent was revoked, and cannot be charged for something that is impossible to avoid being guilty of?