The Binary scale is the theoretical decision making process which ultimately comes into play when judging whether it is more preferable than not, to have sexual intercourse with a given member of the opposite sex at a given time. Just like the real life "sex or no sex" decision, there are only 2 possibilities: 1 representing "yes", and 0 representing "no".
It is a great way to break down the completely arbitrary 10 point rating
scale to a level that can be analyzed and compared by all, with relative ease.
John: "Hey Paul, did you see that girl over there with the tight jeans?"
Paul: "Ya man, she was definitely a 1!"
John: "Haha, good use of the binary scale!"
George: "Hey man, guess who I nailed last night?"
George: "The groupie with the curly hair"
Ringo: "Awwww man, she is a zero in my books!"