Filippo Zambelli, PhD senior research at the Eugin Group R+D area, contributes with other international experts explains in this article published by BBC which debunks the myth of the fertilization process.

Fertilization has always been explained as a story in which millions of tadpoles with gigantic heads and thin tails swim frenetically in a hostile environment with a single goal: to reach the egg that patiently awaits their arrival.

The fastest and most agile sperm that manages to complete this marathon feat wins the prize. It conquers the ovum, penetrates it, and thus an embryo begins to take shape.

However, this account does not accurately reflect how this event unfolds.

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Original article (in Spanish): Por qué es un mito el que los espermatozoides nadan frenéticamente hacia el óvulo durante el proceso de fecundación – BBC News Mundo