I hate that term. It’s an attempt to be clever or make the act of boozing it up seem cute. Having a few people over for some adult beverages sounds awfully boring, plus it puts too much emphasis on the beverages. If your main motivation for doing something revolves around the fact you’re drinking, maybe it’s time for a break. I mean, if you have a bottle of some Silver Oak or a nice Ruffino Gold or something, yes… please advertise. But specify.
Adult Beverages is like calling Thanksgiving Turkey Day.
Plus, there’s only one adult beverage.