Absolutely untrue. Unless they are deliberately aiming for the very lowest targets on the menu, most guys struggle in this regard, and many do not care to try at all.
If existing cases are any indication, generally the more aggressive "testosterone posioned" type.
Such a huge stereotype it isn't even funny. A guy doesn't have to be aggressive or testosterone poisoned to rape a woman. The geeky guy can be just as likely to rape a woman.
Heck, I knew many guys on the ship who held the belief that the more women they went after, the more chances they have. And one guy the others would claim that he just went up to a woman and told her he could only get off through masturbating so he could go all night for her (apparently this worked). One of those "go for all" actually propositioned me on the way home from a division picnic one day. He accepted the rejection with a shrug and no problem.
I think way too many guys in this conversation are going off of either their personal attractions and attitude or the stereotypes of men that are out there. I am going off of my experience with men. I may not attract a ton of guys, but I attract my share (or at least I did when I was single). And I'm also pretty observant. Women who dress in less clothing are not really attracting a ton guys more than me or than I did. (Now, my sister can attract quite a few guys herself, but it doesn't really matter what she wears, she has a good sized butt and bust on a small body.)
I don't have the slightest idea. Certainly none I've ever met.
Where are you hanging out that "librarian types" are so common anyway?
I'm not exactly outgoing in what I wear. And I've known plenty of guys who thought of me as the librarian type. Heck some of my guy friends on the ship swore up and down that my sweet and innocent attitude was all an act and that I was really a dominatrix type in bed. I rarely wear makeup or contacts (prefer my glasses to sore/sticky eyes). Even at the bars I frequent, I don't exactly dress up, yet I can attract my share of attention (well, harder now because of a single piece of jewelry I always wear, but eh not worth hiding the fact).
But really it would depend on where you are to begin with. Where do you normally go to pick up women to sleep with? Where do most guys go? Now which of those guys exactly are most likely to rape a woman? Can you pick them out in the crowds? Because I'm willing to bet you can't pick out the potential rapists based solely on clothing. And even their actions aren't likely to give them away completely either, maybe if you knew them pretty well, went out with them.
Plus, another problem with the assumptions being made here is that "misunderstanding" type incidents only happen or happen most because a guy is only looking for a woman to take home (wherever) for sex. It is also possible for these incidents to happen when a guy is looking for a more serious relationship, but still figures he might get lucky with her (maybe they've talked a few times at the bar or danced) but misreads the cues.