“I’ll get this round, and you can get the next hundred rounds. Top shelf liquor only, please. I have standards.”

A few words can send a lot of subtle messages. Saying the above demonstrates that you don’t really care who is paying, but you’ll have some fun with the situation anyhow. It also shows you are not buying her drinks to appease her and won’t be the type of guy who gets used like a walking ATM, yet still pays homage to human nature and the deep desire of women to see resource displays in the men they are considering for sex.