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1.
(Also known as the "Rule of 7")

The Standard Creepiness Rule is an equation that determines the youngest possible age of a potential date that is deemed to be socially acceptable and not creepy. It was mentioned in comic 314 of the web-comic XKCD. According to XKCD, the rule is as follows:

"Your age" (in years)÷2+7=Minimum socially acceptable age of your date

Be sure to follow PEMDAS.

Also remember that the rule is not set in stone and that it is superseded by legal restrictions and the presence of a consensual agreement.
Brad: "Hey, do you think it would be O.k. for me to go out with Rachel?"

Ryan: "Well you're 32 and she's 24, and since 32 divided by 2 plus 7 is 23, the Standard Creepiness Rule says you can date her."

Brad: "Ha-ha! I just have to remember that even though it's called a 'rule' its more like a 'guideline'."
by languagefan May 21, 2011