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A quantitative measurement of one's promiscuity to allow for easy comparison, bragging, etc. It is calculated by multiplying the number of sexual partners with the combined age difference. The combined age difference is calculated by adding the age difference to the most younger partner with the age difference of the most older partner. If I have slept with 5 people, and the age difference to the most younger one is 2 years + the age difference to the most older one was 3 years, then my dirty number is 5*(2+3) = 5*5 = 30
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