BSPM

Ball Slaps Per Minute - The speed at which the thrusts of sexual intercouse occur measured by the amount of times that the balls contact the clitoris, in the doggy style position, per minute. When in other sexual positions the BSPM count is based on the amount of time the balls make contact with female or male skin per second.

I was banging this girl the other night and when I reached 957 BSPM's my testicle exploded.