I don't see why you can't just open girls on the street and be such a cool guy they want you to come with them, you should never have to bribe them with drinks to 'let' you come with them. It's really as simple as open then, get a little banter back and forth, ask where they're going that night, they'll tell you, then you can either say "oh yeah I've heard about that place, what's it like?" Now they'll either invite to come with and find out, or tell you that it's this awesome place (why would they be going there otherwise?) now you just say something like "that sounds cool, ok I'm gonna see if you guys are right and tag along for one drink" the one drink is kind of a false time constraint, so they don't expect you to be hanging around all night, which you won't, because you'll be off gaming
Of course none of that is set in stone but in my opinion it's a much better way to go about it rather than "let me come with you and I'll buy you drinks then promise to leave you alone because there's no way you'd wanna spend anymore time with me" plus when you buy said drinks, everyone at the bar will see you buying drinks for girls and then watch them walk away from you.