Are the "hookup culture" studies out there a good representation of the typical University.?

No, you can't draw those conclusions from the studies, since they would have no external validity. Anecdotally, one might surmise that similar behaviors exist among other populations of college students, but you would need to have studies done (unless something about the study gave evidence to the idea that the factors determining the behavior were age and enrollment in a college, not anything else).