13. 13 is bad luck
But three’s a lucky number
14 would agree

from Benedict Smith – A Haiku For Every Girl I've Ever Slept With on Rap Genius

Meaning

Smith dedicates two haikus on this list suggesting that they were both part of a single instance — that is, he had a threesome, hence the math: 3 is lucky and there were 2 girls, twice the usual one

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