I've seen this a lot in feminist literature, and it's this unwillingness to acknowledge and deal the patriarchal valuations of our culture. Going so far as to redefine "virginity" or "slut" because the connotations of the terms don't please them. It's a word that means you sleep with a lot of people. Get over it.
Well, the negative connotation usually comes with a woman being promiscuous. If a man goes out and screws everything in sight, it doesn't have the same negative qualities as a woman going out and screwing everything in sight. Society looks down on women with multiple partners, but when men sleep around, it's seen as an achievement. He has conquered, while his female counterpart has degraded herself. He is seen as a stud, and she is seen as easy. It's really unfair to women, and humanity in general.
An example I'd like to use is Kristen Stewart. It's well known that she cheated on Edward Cullen with some ugly, balding married man. Although both of them are to blame for the act, she is the one deemed a homewrecker. Leann Rimes and her disgusting Eddie Cibrian cheated on their respective partners with each other, but in the general view, she is the one carrying the negative weight. The only famous slut I can think of who doesn't carry this public shame is Cher. That bitch does what she wants, when she wants, and makes no apologies. Get it, Cher.
Anyone who sleeps with more than one person can be labeled a slut. My mom has 4 kids from three different men. What a ho, right? I have had only one sexual partner in my life, and since I don't meet the criteria of being a slut, people might label me as prudish. Or a weird lesbian. The point is, they are just labels coming from an outside view, and not how I personally feel about myself. When we joke about my mom being a slut, she just cheers and says, "YEAH! I WAS YOUNG AND ALIVE! WHOOOOO!"
Get it while you're young, folks.