My friend, it's just another game. You thought there was only one game?
Why would a girl give it up if she thinks she can get more, even if it's just dinner?
OTOH, you'd be surprised what can happen if you tell a gal, "I, uh, am not really interested in dating--just having fun." And then assume it's over.
BUT, it's not always over--you just let her know where you are coming from, and from now on it's her call.