little black book
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Whether it be on TV or someone we actually know, we have all heard of a little black book being kept to rank females in. Now you can have your very own black book, however if you think it is simply writing down a name and mark out of 10, then think again.
Although that is the general principle, the idea is how many pints it would normally take for you to do the deed with said girl and you can also write her name and number if you can remember any of them!.