Are you and others saying this stuff seriously nuts? Even Akin has disowned his comments. As best I can tell, Akin himself is no longer claiming women's bodies have the magical ability to prevent rape pregnancy. Armies have used rape as a weapon and have throughout the history of warfare and occupation. A completely obvious recent example is all the German women raped by a conquering Red Army. There were thousands and thousands of unwanted pregnancies - many resulted in the suicide of the mother and obvious resulting death of the fetus.
It doesn't mean pregnancy can't happen, but it makes it difficult to happen.