I understand those are noble words, but there is a huge difference between opting to risk yourself being hurt and possibly killed, than risking a loved one hurt and possibly killed - COMPARED to dying to stop a loved one from being hurt. Of course, it depends on hurt how and how great a risk of death involved overall for the loved one versus myself.
Although I'll avoid the absurd phrase "legitimate rape," rape is a huge spectrum of what that means - and specifically in terms of harm done and how much residual harm remains?
Maybe not you, but my "loved ones" (which is a VERY short list) benefit from and need me for the future in numerous regards. In a few ways maybe uniquely so too. I can think of no instance where getting myself killed would then prevent my wife being raped. Rather, it would seem to assure the rapist would have to kill her, her being witness to my murder. BUT, setting that aside, my death doesn't help her. She already well knows I am entirely willing and able to be violent and hurt men for her. I would have nothing to prove up to her or to myself.
I also am certain her foremost consideration and mine - and our children - would be focused on this thought about each and all of us: "stay alive."
If it is a choice between breaking my arm or her's, beating the hell out me or her, shooting me or shooting her, take out me. BUT that is not the OP question as I read it. The question is would you die - knowing you will die - to prevent your wife being raped. I am 100% certain my wife would absolutely want me to not die in that situation. I know if it reversed, I absolutely would not want her to die.
And I suspect, tables turned and this exact question put to her, her perspective would be exactly the same as mine - declaring she would prefer her hurt than me.