[Burnin' oil]

I suppose it depends upon what your expectations/hopes are. A seventeen year old high schooler and a 20 year old partying college girl seem destined to get busy. Another, perhaps larger, issue is safety, i.e., transportation. If there is drinking, there will be drunk driving. Your son may not drink and drive, but, as we all know, our judgment is not at its peak when we are drunk. He may drive or, more likely, ride with someone who is impaired. High schoolers, booze, cars, peer pressure and up all night is a bad combo. My rule, for both of them, would be absolutely no drinking. I've said too much.