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Why did the Pythagoreans connect the number 5 with marriage?

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Close-up of a sunflower head showing seeds arranged in a spiral pattern that follows the Fibonacci sequence. — number symbolism The head of a sunflower arranged in a Fibonacci sequence.

In the Pythagorean tradition, the number 5 was connected to marriage because it represented the sum of the first even number (2) and the first odd number (3).1

Within their system of number symbolism, the Pythagoreans associated even numbers with the female and odd numbers with the male. Consequently, the union of 2 and 3 to form 5 was viewed as a symbolic representation of marriage.12