What do you guys think of such female?

well if all she is only about the sex then let it be known. She shouldn't lead the guy on and let him think they are exclusive. She should let him know that it is ok to go out and meet other women because she is not interested in a relationship. Basically, she is really into herself and if she is not honest then she is basically a selfish bitch. If someone says they are getting mixed signals then they are confused. To keep someone in this state of confusion is referred to as "mind games". If he is confused the best thing to do is for her to sit him down and tell him.
"I like having sex with you but I'm not ready for a relationship at the moment"

The best thing for that girl to do is clear up the confusion. The conversation should be held in person. I suggest she should write down her thoughts before the conversation. That way it is crystal clear what she is trying to explain.

It's not that the girl is a bad person. If she lies and leads the guy on, or if she is just keeping him around because she is afraid to lose him then she is acting a bit childish. Mind games are a terrible thing to play with someone. Trust me. if she doesn't clear this up the guy will become resentful and will lose all trust in her.

I am not in school any more and now in a professional world and I have met a good number of those women. Career driven and a couple of times found myself becoming needy to them.

As a rule I stop myself from going a step further than just what she has to offer. That's a woman who knows what she wants, and nothing more nothing less.