"Habrían" is conditional form: For example: Ellos habrían venido si hubieran tenido tiempo. They would have come if they had had time. So the sentence: Habrían consumido el matrimonio Would strictly be: They would have consumed (killed) the (their) marriage Now this structure is sometimes used in past, meaning something slightly different: For example talking about a fire that started during the early morning you may hear on the news: El incendio se habría iniciado a las 3:40 de la madrugada y se extendió hasta las 9 cuando bomberos pudieron apagarlo. So, it uses "habría" indicating that it is suppoessed to be that way, though there is not complete certainty. I hope this helps, Cheers, Mario

La frase correcta "habrían consumado todo el matrimonio", esto significa, si realizaron el acto sexual después de haber contraído nupcias, es decir, después de haberse casado.