The lyrics of the song make reference to the naked, "animal", urgent sexual desire: "when the body does not expect what they call love" / ("Cuando el cuerpo no espera lo que llaman amor ..."). In these conditions, Cerati confesses that "words do not help me, moaning is better. (No me sirven las palabras, gemir es mejor)"
The key word of the chorus and the song is "more" (más): More is asked and lived (Más se pide y se vive). The phrase admits several readings:
Living is asking for more
More is requested, more is lived
To be alive you always have to ask for more and more
Basically it is an "animal song", that is, a song that comes from the animal side of man and woman, from the most basic, most direct, immediate, irrational desire not mediated by social conventions, "animal".
However the lyrics also say that there is "nothing sweeter than desire in chains" (nada más dulce que el deseo en cadenas), somehow recognizing that the limits imposed by social conventions and love chain desire, making it paradoxically sweeter and more "desirable".