Needless to say, Ripley's betrayal of the colony's founding principle brings havoc upon them all. She is able to redeem herself only in an ultimate act of self-sacrifice, by throwing herself into a cauldron of molten metal as the monster bursts out of her chest. She takes the plunge with arms outstretched in cruciform shape. The only thing that can tame Eros and direct it to an end that can satisfy the sexual passion is love, which leads Eros away from death and, quite literally, toward new life. When a specific person is the object of love, no substitute will do.
Love demands exclusivity, and receives it in marriage.
The desire for oneness in marital union is also a thirst for fecundity. Since the other person is not loved, pornography requires depersonalization and anonymity. With pornographic sex, substitution is not only acceptable, it is essential. As theologian Josef Pieper said, pornography removes the fig leaf from the genitals and places it over the human face. The central act of civilization is the recognition of another person as a human being.