"That's what the girls say" is a comedy play by the Spanish writer Leandro Fernandez de Moratin, which is considered one of the most famous plays in world literature. The plot revolves around young heroes who unknowingly find themselves in political and social intrigues through the capricious world of adults. The author successfully combines the sharpness of satire with a deep understanding of human nature, revealing the complex relationships between older and younger generations. This play raises relevant questions of morality, education and freedom in a universal context, leaving important conclusions for the reader in all times. "El sí de las niñas" is a masterpiece of a Spanish classic that remains relevant and exciting today.