According to the Los Angeles Times, this concept goes again to the 1920s, when Princess Marie Bonaparte — a psychoanalyst, Napoleon’s good-grandniece, and a near mate of Sigmund Freud — acquired disappointed with her have lack of orgasm and started accumulating data from her clients. She discovered that women with a clitoris considerably less than 2.5 centimeters from their vagina, around the length of the tip of the thumb to the initial knuckle, orgasmed additional usually all through penis-in-vagina sex. She referred to as this the “rule of thumb.” Eventually, Bonaparte underwent two experimental surgeries in an endeavor to bring her clitoris nearer to her vagina — which, in accordance to ABC Information, did not go so properly. Bonaparte abandoned her task.

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