Whore Factor
Every guy has used it before. the Whore Factor is a basic scale ranging from 1 to 10. A normal girl has a whore factor of 5. A slut would have a whore factor of ten which basically means that you should stay away from her because she has a vagina disease. A girl who likes pink bunnies and the crappy Carebears would be a whore factor of 1.
The highest whore factor I humped was an 8.