The anthropological response? Poor people need large families in order to bring in more income. The theological answer? Mexicans don't believe in contraception because the Catholic Church considers it a sin. But there's a reason why the American media constantly casts Mexican actors as Latin lovers or spicy señoritas and gives them 30 siblings, and it ain't the salsa. Ever had sexo with a Mexican? No prophylactic in the world can hold back a Mexican spermatozoa during the act of coitus—those little hombres rip through your average condom like an Aztec tearing up a conquistador's sternum. As for oral contraceptives? I have many Mexican friends who were born while their mamis were on the pill. The gun-toting doofuses of the Border Patrol can't hold us back from starting a new life—what makes you think a puny pill can?