As a man of the night (and a man on the town oi oi), I can safely say that, while she will not exactly laugh in your face for ordering a lager, she will forever judge you for it and never wish to get close to your dirty larger-drinking prick. Instead, I would recommend an old trick I learned up in Coventry: slip the barman a 20 quid note and ask him for a "old twist round the back". Don't worry, as an ex-barman, we all know what this means. He'll bring you some hard stuff that will make sure you get some serious go-time with that hottie.
No need to thank me, I do this for the good of the people.
MEG