Oomis1105, with all due respect, do not tell people like Sam2 to go re-read the Torah — he is at least somewhat of a Talmid Chochom, and you are not.
The reason why a woman is not obligated to be killed to avoid being raped(chas^ve’sholom) is because she is considered to be an inactive participant. If someone puts a gun to her head and tells her to go do an active act of gilui arayos or negia, she is obligated to be shot and not do it.
Also, negia is not a capital offence, but it is yehareg ve’lo’ yaavor. It is a clear din in Gemora and Shulchan Aruch.