There is no such thing as a female "player". Women basically choose (choice being the big word here) to date a lot of not. Men have to "play the game" in that we have to plan, initiate, out chess the other guy, get our logistics right etc. women are receivers of this. Basically, women are the game, they are not players. That said, how does one tell if she dates/sleeps around a lot or is a keeper? Depends. If I know her, she has a history. If not, only time can tell. I personally love sexually aggressive women and would call her a "keeper"
You want point blank honesty? I'll never be serious with a girl who has even kissed a black guy or has ever been slutty. Yeah, I may go on dates and hook up with them, but I'll just cut them loose if they become inconvenient or if I find someone better. I have no respect for slutty girls/coal burners.