Homosexual acts prevent us from imaging God's fecund nature with our sexuality and therefore work to contradict the image of God in which we were created and meant to live.
Openness Vs. Fertility
Sometimes objections are raised to the necessity of the openness to life in sexual relationship by noting particular situations in heterosexual relationships. Women are only fertile at certain times and they eventually progress past their childbearing years. And some people are not physically capable of having children at all. How can we say relationships with these situations reflect the openness to life that images God's fecundity in a way that homosexual relationships do not?
As in the first column, a rough analogy may serve to shed some light on this subject. Consider that man creates light bulbs and light sockets in order that electricity might flow from one to the other and that light might be generated as a result. During the normal cycle of day and night, we sometimes find power flowing through these connections that results in the generation of light, but sometimes we do not. Eventually light bulbs burn out. Occasionally there are power outages. Given the right conditions, a particular light bulb or light socket may be manufactured in such a way that it may never be able to complete this connection or generate light.
Understanding all these various situations that sometimes occur, we could not legitimately conclude that two light bulbs or two light sockets are just as well suited for pairing as one light bulb and one light socket. Even with several different types of individual circumstances that result in a particular bulb and socket not completing a connection that generates light, we cannot say that the light that often shines as a result of this type of union was not the intention of man when creating these pieces that fit together.
If we did, we would indeed be living in the dark.
What then can we draw from this analogy? It is not the individual natural circumstances of particular persons in a relationship but rather the type of relationship between persons that determines whether we image God's fecundity by being open to life.
Heterosexual relationships, when not deliberately frustrated by acts such as contraception or sterilization, are by their very nature open to life by virtue of the sexual complementarity of the persons involved, whether or not that life actually comes into existence. Homosexual relationships are by their very nature closed to this life by virtue of the lack of sexual complementarity.
Sexual Complementarity in the Words of Jesus
Finally, it has often been claimed that the Gospels and Christ never addressed homosexuality. Although not explicitly mentioned by name, it is implicitly addressed nonetheless in a response by Jesus to a question about divorce in which He mentions sexual complementarity.
In Matthew 19:4-6, Jesus says, “Have you not read that from the beginning the Creator ‘made them male and female’ and said, ‘For this reason a man shall leave his father and mother and be joined to his wife, and the two shall become one flesh.’ So they are no longer two, but one flesh. Therefore, what God has joined together, no human being must separate.”
(Column continues below)
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This is a very important verse which is expounded upon by John Paul II in his Catechesis on Human Love. Notice that Jesus is pointing out that the Creator said we shall be joined together by God in the one-flesh conjugal union of marriage precisely because we were created as two sexes. “From the beginning”, it was God's plan for sexual union and marriage to be a result of our creation as two complementary sexes.
God's desire is for us to be drawn into the life of the Trinity – into life-giving communion with Him and with each other, and to reflect this life with our sexuality. Even though we might experience same-sex attraction, we cannot ignore God's invitation and the image of His life present in our sexual complementarity.
This does not mean that all people are called to marriage, however, and I will discuss this further in the next column.