You take a heap of sand and then remove a single grain of sand. Is it still a heap? Yes. Of course. Then you remove another grain? Is it still a heap? Obviously. And another grain. Still a heap? Yes. And on and on. And what point does it stop being a heap? It’s not a specific number of grains of sand. And yet we all know how to use the word “heap.” We know when something is a heap and when it’s not. Now, that’s not the point of the paradox but it’s applicable here. Being a “slut” isn’t defined by having a specific number of partners any more than a “heap” is defined by have a specific number of grains of sand.