What is a whore?

What makes a whore? Who is a whore? Why do we call people (females) whores? And what is the difference between a whore, hoe, tramp, and slut? These are questions I ask myself, and everyone else around me, and still havent been able to get a set response from anyone. I mean the "mutual" definition that i got when i asked around...was a "girl who has sex with everybody". Now that leads to more questions i have no answers to...so a guy cant be a whore? And to say everybody, is an infinitive word, because no one can possibly sleep with everyone. Maybe a lot but not everyone. Anyways So i ask, what is the highest number does a "girl's sexual encounters" get to before she is considered a whore? when i asked around, people said 10, or if you cant count on your hands, or if you cant remember, that makes you a whore. WOW, who put the definition on that? And why if a guy has sex with a lot of females preferably 10 or more, he is considered a pimp, or a playa, but not a whore. Thats sort of a double standard dont you think? And so what makes us think its ok to call people whores? I mean why cant the person just like to have sex, with different people. Seems like we have put a label on everything, without putting any actual definiton behind it. We shout out names, and dont really know or understand what they mean. Even though we dont have our own decisions, or intakes on situations, we still need to have an understanding about the things that come out of our mouth. So anywho, if anyone can answer these questions for me i would appreciate it, because i am not coming up with any answers.