The reporting rate for all sexual assaults is about 2% of actual crimes committed (jurisdiction-dependent, I see Batts just cited 16% which may be true in his case). It is a common crime everywhere, not just at post-secondary institutions, though they tend to have a better awareness of it.
Regarding "victim blaming." The victim is never at fault, and in most circumstances sexual assaults are motivated by opportunity, ability, and power. Physical appearance plays a very minor role in most sexual assaults. It is every person's right to be able to go where they please in public wearing whatever they please and not feel threatened or harassed, or be criminally victimized. That said - I've mentioned before that I work in law enforcement. This is where I tend to be at loggerheads with most campus advocacy groups - everyone has a responsibility for their own safety. There is a difference between acknowledging your right to do something, and realizing that doing it may have consequences because other people are not respectful of that right. I would never blame a victim of rape for enticing it; but I do advocate to everyone I know, particularly females in the context of this discussion, to take measures to keep themselves safe. That means not getting drunk in an unfamiliar place without people you can trust to remain as a group. That means not going on a date with someone you just met without telling anyone where you're going, who with, and when you'll be back. That means setting clear boundaries in person interactions - it means expressing that you're not consenting. That means not accepting a drink that you didn't see poured at a frat party from some guy who just walked up to you. And it means being conscious of where you are, what you're doing, who you're with, what you're wearing, what signals you're sending (I mean overt, not implied), and where you should be.
This is the trouble that a lot of men in particular have when it comes to "victim blaming." What they mean is to express concern for safety, not imply that because someone didn't take those steps they deserved what happened to them.
As I used to scold a number of my female friends: You can have all the legal rights in the world, but if you don't take responsibility for your own safety then someone, somewhere, is going to think they can take them from you.