You've got me thinking here, too, Paul. I don't know, when I think about it I really can't imagine having a date with someone who drinks, at least initially when I'd be trying to get to know them. Even if it's a normal drinker, with one or two drinks there's still a chemical buffer that I'd be potently aware of.
Maybe it's different for you gents.
I haven't had that experience, but those are just my thoughts.
Anyway, good luck on your date, and let us know how it goes.