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.
It's a bright line from the guys perspective. If you see that the gal is willing to bed any decent looking guy in the joint, then she's considered a slut. But if she is aggressive only towards you, then it is a helluva compliment.
Where they live is not nearly as important as how they live... can live in a all female dorm all day long and still be at the frat house every night.
Character dictates behavior. Yes avoiding temptation is a crucial ability, but how one behaves in the face of it, shows their true character.