talking with you.

Things women do when they are flirting:

Stand close to you eyes wide open when you are talking.
Touch your hand, lower arm, stomach or upper arm (if they touch your upper arm they are testing muscularity).
Bump into you lightly
Say "you are so bad" when they say that they are saying that you are interesting and possibly fun to be with.
When they sit next to you they will always cross their legs to your side. They may lean slightly towards you.
They answer questions with multi-word answers.
They will touch their hair or neck while you are looking/talking to them.

There are alot of other signs which people will probably articulate in other posts.

think that someone is flirting me you just because she is being nice and polite (which has happened to me quite often).  However, if I'm flirting with someone, I do like to twirl my hair. I guess it's sort of the little girl coming out in me again . . . telling the man, "Yes,I'm vulnerable and I want you."
I also give a daring, sexy smile toward him and start to gently rub my legs.

Hugs,
Ciara

grabs you in the crotch.

Watch the eyes and the smile first.  If there's a little extra effort put into them, more than what would be merely friendly, she's flirting.

From there it can go into too many directions to really say, but if her eyes and smile indicate it, keep the conversation light from there, and see where she takes it.  Also, once she has your attention this way, be aware of what part of her body she's drawing your attention to.  Like she'll sometimes stroke her hair, wanting to draw your attention to that and see your reaction.  Once she sees you noticing it, pay attention to her reaction. All the time, keep the conversation light and funny.

Of course, she may also flash you a nipple, or show you her nipple ring. As I said, it can go in many directions.

/Zin