I guess you didn't go to school in Phoenix. I had to beat 'em off with a stick!
Having a daughter (or two, in my case) changes one's perspective on this topic substantially. My kids will not be living in dorms at colleges with co-ed dorms, unless they foot 100% of the bill. Nor will they be living off-campus (not at home) unless I have substantial confidence that they've selected their roommates very carefully. Period.
Well, there's your problem. Not using the right tool for the job.