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Why did Pythagoreans connect the number 5 with marriage?

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Marble bust of Pythagoras, the ancient Greek mathematician and philosopher, showing a bearded man with a head covering and calm expression. — Pythagoreanism Greek philosopher and mathematician Pythagoras, portrait bust.

In the Pythagorean tradition, the number 5 was connected to marriage because it represents the union of the female and male principles.1

Pythagoreans considered 2 to be the female number and 3 to be the male number; their sum, 5, therefore symbolized the joining of these two forces in marriage. This association is rooted in the broader Pythagorean philosophy, which viewed numbers as the fundamental, unifying concepts of the universe and attributed specific symbolic or quasi-rational properties to them.12