Same as if it were a male friend. I tend to prefer to buy my own just for simplicity's sake, but if somebody buys for me then I'll keep it in mind to return the favour when the opportunity arises. I'll keep the cost sensible both because I don't want to take advantage and because I'm easily pleased, I wouldn't buy myself an extravagant meal and I wouldn't expect anybody else to buy me one either.
Fnord wrote:
Whoever does the inviting pays the bill.
If that were always the case then, especially with the traditional expectation that men are always to ask women out and not the other way around, men who are trying to date would spend a lot of money and women would spend none. Some expect this to be true, I do not. Even amongst friends, aside from dating, I don't expect to have my meal or drinks paid for by somebody else if they ask if I'd like to go out (or vice versa), it's purely an invitation to attend a place together, not a financial arrangement. Could you imagine how much it would cost to seek friends or potential partners if you were looking to meet new people and you had to always pay because you were the one reaching out to expand your social circle? That opens up doors to being taken advantage of too, and some might see it as trying to buy company.
I don't mind offering to buy somebody a drink or something, it's a trivial cost, but I won't accept being
expected to hand out free lunches just because society says I'm supposed to be the "leader" in the relationship. I think to prevent unnecessary arguments/bad feeling it's best to just order what you can afford and then pay for what you ate, unless somebody says "I'll get this" at the end with the full knowledge of what it will cost, otherwise even going 50/50 is going to allow room for abuse of generosity if somebody orders the gold leaf and champagne lobster and the other orders a bacon sandwich.
I'm not a tightwad, I have it in me to be generous (and sometimes I like to, as a gesture of friendliness), but I may not always be flush with cash or necessarily interested in offering it, so making assumptions only leads to embarassment. Nobody owes anybody anything (unless they explicitly do because they borrowed money or something), I think it's always best to keep that in mind.