Marriages can exist even in cases where none of these is present, though such marriages are probably unhappy. Each of these important aspects of human life, in turn, can exist outside of marriage, and they can even exist all together outside of marriage, as is evident from the fact that many unmarried couples live lives of intimacy, friendship, and mutual responsibility, and have and raise children. Nonetheless, when people ask themselves what the content of marriage is, they typically think of this cluster of things.