Actually, my gf does do that
and when she does, I actually feel bad for the guy, it's brutal.
It's not that women don't do it for you no matter how much they are into you. It just depends on the girl. If she's the type that needs to be ladylike and polite, chances are she doesn't want to be a bitch and do it. She expects guys like us to step in and stand our ground and claim them. It's a hassle for us to step in, but to them if we step in, that means we really care about them.
Girls like my gf on the otherhand are scary when they putted down guys

It is entertaining yes, and it does make me feel good how she automatically let the guy know shes' mine, but the way she put them down, maaaaan..... I wouldn't want to be that guy, i'll tell you that.
I had a frat bro, who tried to hit on her in front of me, knowing that she's my girl. I wasn't even aware of it because I was busy talking to my other bro, and she was like: "Oh.... you're that guy who finally crossed this time."
and I was like: wtf..... LOL hahahahah
and then he got pissed and said: "well, it doesn't matter because I crossed! and then walked away.
apparently he gave my gf a sexual handshake, i don't know what the fuck that means, but if it was sexual to my gf, I guess it must be pretty greasy.
If you want your girl to stand her grounds as your woman, you gotta set the standards and ground rules with her. If she does this, that means you definitely have to do it too. Fair for both sides, if you're just dating around or whatever that's not serious, then it's a bit trickier. You gotta stand YOUR ground and not be jealous when other guys hit on her, and calmly handle the situation. When you seem nonchalant about it, she will know how compose your are and will learn to respect that. Practice bantering with her, play fight with her, because the more experience she gets with verbal sparring with you (with humor of course), the more likely she will become comfortable with verbally expressing her "opinions" without having to worry about being polite. Have your friends banter with her too. I don't mean let them flirt with her, if you get me wrong, I mean have her play fight with every single one of them, guys or girls. If she's comfortable with her words with you guys, she will one day put down a guy right in front of your eyes and you will be surprised.
My gf used to be shy until we played fight and then she met one of my friends..... hahaha
- Nelson[/img]