---An open woman controls her sexuality and has a lot of sex because that's what SHE wants. It's a means of expressing herself. A slut just gives her sexuality over to any guy who walks up because it's what HE wants. To a slut, sex is a form of currency with which she buys relationships.
First part---interesting! Second part---fits more to my definition, whereby a "slut" is a woman or man who uses non-marital sex to forward hers or his own interests to the detriment of someone else. As a few of you know, the whole concept of "slut" is something I've been wrestling with for personal reasons for some time, in particular the difference between women who just love sex and are turned on by men who are sexy and can fuck well (no different from men in that regard, but MZ is right---no similar negative-connotating name for the men), and those who use their sexuality to climb over people, gain status or money in life, ie--- having sex NOT for sex sake. As a younger man, I used to treat all women as sluts or potential sluts, but am finally growing up (not yet, hence the avatar) in that regard. I admit to having spent a lot of time with a woman who slept around outside her marriage because she needed to feel that she had the sexual power to attract many men and because she liked eating out. With her, it was not for sex (her idea of a good time was how many times the guy got off, with her orgasms being a relatively minor issue). She also admitted that she was being a slut in the process, and she relished the definition. I also admit to having attempted to turn women into what my definition of a slut is, and have finally recognized that they are merely women who love to fuck as part of the whole prism of life's experience. They are not "sluts" in any way, shape or form.
I know little about other languages, but have an idea that it is only in English (and perhaps Arabic due to their religions) where we don't have a name for sexually interesting and interested women that doesn not have so negative a connotation as "slut". I've tried to think of a more suitable name, but have failed.
I'm belaboring this, and apologize, but I'd like to add that I have no problem with the women caught unprotected in the world who must sleep with certain men in order to endure. These are not sluts, but survivors, and if fucking a guy puts bread on the table for oneself and one's responsibilities, so be it. That's why whores who are forced to support pimps are not sluts per se---only tragic figures caught in a vise.