I think it's supposed to be good 'cause that's a place they wouldn't "search" for or expect someone to carry such device, but then again, I don't think rape can be expected in the first place, so that defeats the point. Besides, it's hard enough to defend yourself with other things, like you said, let alone something you have to insert in your vagina to do it. Hey maybe you can pretend to "want" the rape and when he's ready to "go in" you just quickly stick your fingers in there and put it in. lol I'm sorry, I know I'm being ridiculous, but it's only 'cause this whole thing seems to be too.