In Brave new World by Aldous Huxley why is Viviparous a swear word?

In "Brave New World," viviparous is considered a swear Word because in the society created by Huxley, natural reproduction is seen as primitive and taboo. The society relies on artificial methods like the Bokanovsky Process for reproduction, making viviparous (natural birth) a shocking concept. The Controller uses it as a derogatory term to emphasize the society's rejection of traditional reproductive practices.