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Well, how many rape scenarios would a gun feasibly stop? Would a gun help if you're drugged unconscious or too drunk to handle one safely? Would you be able to reach and operate your gun if you're getting intimate with someone and they start going too far (and without them overpowering and taking it from you)? Is lethal force lawful if someone approaches you without a weapon? If not, is it already too late to pull and use a gun by the time their intent is clear, let alone clear enough to exonerate you after the fact? If they do have a weapon, can you get your own out in time before they use theirs?
The rough percentage of rape scenarios where I can imagine a gun would be worth carrying to prevent is very small. Pepper spray or tasers, on the other hand, could be useful in more scenarios, require little training, can be carried in more places, and pose much less danger to yourself if taken from you.
