<p>I think there is also a difference between two college age kids who each live in dorms and two college kids who have already moved out and live together in off-campus housing. In my mind, when we have this discussion, I picture the former - Bob lives in this dorm, Susie lives in that dorm, they’re going away to Susie’s parents’ house for the weekend. If Bob and Susie already live together in an apartment off-campus (sharing the same bed), then that feels qualitatively different to me.</p>