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If we define the bases in sex as: 1 - French 2 - Feel 3 - Finger 4 - Fuck then it stands to reason that instead of [calling it] 4th base, we would say a "Home Run" if it happened in one night. Then, in baseball terms a "Grand Slam" is a "Home Run" that scores 3 [additional] points or "Runs", it stands to reason that a "Grand Fuck Slam" would be a "Home Run" that scores 3 additional points or "Runs." In colloquial terms: a Grand Fuck Slam is [having sex] with the same partner 4 times in one night, where both partners reach their climax each time.
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