As a practical if not legal matter, people can do more or less as they please in their own homes. But I'm personally glad I went to college at a time when drinking alcohol was pretty much all above board. (At least at the time, the fact that the drinking age was legally 18 meant that drinking as a college student was pretty much OK even if you weren't actually 18 yet. The local bar we frequented was fine with just a college ID; they didn't otherwise check age.)