Julie, I know for a fact chicks still like people to buy them drinks, and this goes for lesbians as well. One of my best friends, who is a lesbian, always buys drinks for the chicks she's interested in, though she's now in a committed relationship and is undoubtedly the more feminine one of the couple. I open doors for people often, men or women, though I'm attracted only to women. I don't know exactly when chivalrous behaviors became designated as something particular to the male gender, but I think it's ridiculous. While you might lose a lot of money with your chivalry, it also might well get you somewhere. Lesbians like to be romanced just as much as straight women do, so I don't think it was a bad move on your part at all. However, you might want to be a little tighter with your money next time so you don't end up too broke for the second date.
Rafe