The reason you don't know about this is simple. Outside of specialty family planning clinics that are few and far between, health care organizations don't educate people about all their birth control options and don't make them easily available.
La razón por la que ustedes no saben esto es sencilla: Fuera de las clínicas de planeación familiar, que son pocas y distantes entre sí, las organizaciones de salud no educan a la gente sobre todos los anticonceptivos y no los hacen accesibles.