mathematician

A sexual act where one person (male or female) kneels at a man's side, and with the fingers of one hand probes the anus in a calculator-button pushing motion. The other hand grips the penis and strokes it in a crank handle fashion, as if he or she is operating an old-time crank-handle calculator.

Sally promised the college math professor that if she performed the mathematician on him he would shout out prime numbers at the top of his lungs.

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