"[[w:Procreation|[P]rocreative]] intercourse fulfills because it expresses the human person's desire for self-perpetuation. It expresses it and does not contradict it, as contraception does. It is only on life-wishes, not on death-wishes, that love can thrive. When a normal married couple have a child, they pass their child joyfully to each other. If their child dies, there is no joy, there are tears, as they pass its dead body to one another. Spouses should weep over a contraceptive act: a barren, desolate act which rejects the life that is meant to keep love alive, and would kill the life their love naturally seeks to give origin to. There may be physical satisfaction, but there can be no joy in passing dead seed; or in passing living seed only to kill it."