I was called an idiot here for even considering that there might be an autonomic response to stress/fear that might make conception less likely.
I was thinking of adrenaline, and also auditory exclusion and how it may prevent hearing damage in self-defense shootings.
I am still waiting to hear the explanation of how considering these very real phenomena, and the possibility one might occur during a rape, makes me insulting and offensive to women.
They allow you to attenuate sound from a specific source by tightening up. Some people have injured the bones and can't do that so they have difficulty localizing sound.
Loud noise can damage them.
The reproductive tract has nothing comparable. Your analogy fails.