Just wondering..

What is the protocol for random hookups when you go out?
I am NOT asking for my own sake, but more out of actual curiousity. Like seriously, let me give you a little scenario here;

So a group of us (boys and girls) head out, and are all having fun, we bump into other friends we know and the group and fun continues. In true girl fashion, two of the irls are soon competing for the same guy. This guy clearly makes his choice and one guy and one girl leave together. Now my question is, what happens with the other girl? the one who wasn't chosen? The way I see it, when you go out, early on in the night people tend to make their little selection about who's 'good' and then that's kind of who they stick to. However if this fails, as it did for girl number two in this case, then what happens?

If I were girl number two, I would probably just give up on all romantic endeavours for the night. Luckily i'm not either of these girls, and what I witnessed is quite the opposite. Girl number two then made a couple of attempts at the other 'available' males. (I say 'available' because most of them had already been selected by other chicks, thus deepening the girl-politics here.)

For example, after all this is over, (or so I think) i'm hanging out with a male friend of mine who was there, at this point I had already heard about girl number two pulling the moves on another guy there, and thought maybe she was just lonely. So anyway there I am just chillin' =D with my friend, when girl number two texts him. Just to tell him how cute he is etc etc /vomits.

I mean seriously, give it a rest. At what point is girl number two crossing the line here? Is it okay to clutch wildly at the straws of the opposite gender just because your own guy wasn't interested? Isn't texting other guys potentially moving into another girls territory?

Is there an end to this madness?