In addition to being used as an argument against artificial birth control and women’s ordination, sexual complementarity is also put forth as an argument against the goodness of same-sex relationships.
According to this thinking, the procreative compatibility of male and female reproductive organs is a type of microcosm and symbol of the compatibility between man and woman as a whole. This argument has three general parts: one, it is only because men’s and women’s genitalia and reproductive organs are different that they are able to co-operate in the creation of new human life; two, this anatomical difference serves as symbol and revelation of the sexual differentiation that extends across the depths and breadths of human personhood—men, as people, are different from women in the way that penises are from vaginas (meaning all men are different from all women in the same uniform and sexually distinctive ways), and three, because only sexually different people can procreate and because this sexual difference symbolizes the difference between men and women as people, only sexually different people (that is, only men and women) are capable of the type of compatibility aka complementarity required to be in a relationship of sexual love and fidelity.
In summary, the argument goes, just as it just “doesn’t work” to have two women or two men try to conceive a child, it is similarly impossible for there to be a relationship of sexual love and fidelity between two men or two women. Think here of trying to cut meat with a spoon or eat soup with a fork. A relationship between two men or two women, they argue, is both not really possible and not really able to contribute to the flourishing either of individuals or of society.
If you are thinking that this argument depends on the type of rhetorical sleight-of-hand discussed elsewhere at WIT, you would be right. Similarly, if you are skeptical about the veracity of sexual complementarity in general, in other words, if you don’t really think that that every man is (and should be) masculine and every woman is (and should be) feminine in the way the magisterium says they are and should be, then I also would agree with you.
However, for the purposes of this post, let’s grant the existence of sexual complementarity between men and women and that it is a prerequisite for “the flourishing of family life” [(I guess this would mean that men would have certain personality traits–assertiveness, leadership, ability to acquire a well-paying job, knowledge of sports, affinity for playful rough-housing–and women another set of traits–deference, kindness, patience, generosity, receptivity, a desire to bear children?) and of course let’s not think too deeply about the centuries-old example of single-sex and sexual non-complementary communities of monks, nuns, and priests whose holiness the church holds in unparalleled esteem…].
Even if sexual complementarity were true, it would not be an argument against same-sex relationships.
There are many types of complementarity, which are proper to particular types of relationships. The fact that same-sex couples lack the type of complementarity thought to be proper to heterosexual couples is not an argument against same-sex relationships. For example, no one would begrudge my grandparents for lacking the complementarity present in the relationship between Michael Jordan and Scottie Pippen because the type of complementarity needed to flourish as husband and wife is different from the type of complementarity needed to be one of the greatest basketball duos of all time. In fact, if Jordan and Pippen attempted to foster the type of complementarity present in my grandparents’ relationship, this would almost certainly be detrimental to their complementarity as teammates and co-workers.
Pointing out that acts which express same-sex love lack (hetero)sexual complementarity does not in any way prove that “homosexual” acts (and, by extension, same-sex relationships as a whole) lack the type of complementarity that is appropriate to them. Stating that same-sex acts lack (hetero)sexual complementarity is merely stating the obvious: that in at least one way, (namely, that they take place between people of the same sex) same-sex acts and relationships are different from heterosexual acts and relationships. While difference can be evidence of deficiency or immorality, it is not on its own evidence of deficiency or immorality. In other words, referring to the obvious fact that gay and lesbian couples do slightly different things in bed is not the same thing as demonstrating why this difference renders gay and lesbian sexuality unconditionally evil.
Thus, when the magisterium claims that “homosexual acts” lack sexual complementarity, all they are really saying is that they do not take place between a man and a woman, that is, they are not heterosexual and therefore both untrue/impossible and harmful. A perfect example of this comes in JPII’s “Letter to the Bishops of the Catholic Church on the Pastoral Care of Homosexual Persons.” JPII points out that same-sex relationships are not procreative, which means they are not “complementary unions,” which in turn means that they “thwart the call to a life of that form of self-giving” mandated by the Gospel. In other words, although gay people can be generous in other areas of their lives, it is impossible for a gay or lesbian person to be generous and self-giving to their romantic partner. Furthermore, because same-sex unions are untrue (that is, they defy what God created us to be, heterosexually spousal), they “prevent one’s own fulfillment and happiness.”
So, to summarize the argument against same-sex relationships: God created people to be married to someone of the opposite sex. To fall in love with someone of the same sex and build a life with them is like trying to get a dog to fly or a dolphin to climb trees: it is both impossible and something harmful and bad. For this reason, we don’t need to actually look at the lives of lesbian and gay people to see if their love is either possible or good because we already know it is not.
However, we know that gay and lesbian couples not only exist, but that they are capable of tremendous flourishing. Just as the vision of a dolphin climbing a tree and living happily among its high branches would cause us to amend our understanding of what a dolphin is and what is good for it, so too does the mere existence of gay and lesbian couples challenge the implied argument that, in lacking (hetero)sexual complementarity, lesbian and gay couples lack the complementarity that is proper to them.
Despite JPII’s claim that we can know via deduction that being gay is bad because it lacks sexual complementarity, all theories of complementarity employ inductive reasoning, including JPII’s theory of gender, even when he claims not to. Thus, just as the characteristics that make for a winning duo are determined inductively, by observing winning duos, it seems that even John Paul’s theory of sexual complementarity was in no small way based upon his experience of gender in the world.
A return to the basketball metaphor will illustrate my point: imagine that in the basketball world, the dominant belief is that a team cannot win a championship without a dominant center. A team can be weak at any position but not at center. Thus, coaches and fans are constantly encouraging their favorite teams to acquire a dominant “big man” saying, “we cannot win without a dominant big man! Only teams with a powerful center win championships! We’ll never win if we don’t trade up!” An observation that no team lacking a dominant big man has ever won the championship quickly becomes a norm, a recipe for success.
Then, along comes the duo of Jordan and Pippen, who together win 6 championships, each time without the aid of a dominant “big man.” The church prior to the “irruption into history” of the gay and lesbian person was like the NBA prior to Michael and Scottie: because for most of Western history, it seemed as though all sexual couples had been heterosexual, it was assumed that sexual couples could only be heterosexual, which then was then interpreted to mean that sexual couples must be heterosexual.
In its inability to recognize the existence of a “genuine and affective complementarity” proper to gay and lesbian couples, the church of today is like the general manager or fan, who, after the Bulls’ 2nd or 3rd championship, keeps insisting, “only teams with a dominant big man win championships!”
For those of us willing to actually see the possibilities for goodness embedded in God’s creation, it is undeniable that gays and lesbians can have a “flourishing family life.” We know that lesbian and gay couples can be good and giving to each other, helping each other to grow in virtue and in love of God. We know that gay and lesbian couples can stay together for life and in the face of gruesome and agonizing death. We know that gay and lesbian couples can be good to their larger extended families and to their communities. However, we can see this only if we are willing to look at the world as God truly created it, not as we thought She did.

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