James Parker came out at age 17 and later entered into a relation­ship with another man. He worked as a gay activist for a while, but his personal experiences of intimacy and human sexuality eventually led him to grasp that “same-sex mar­riage just doesn’t exist; even if you want to say that it does.” He con­cluded that trying to persuade those with homosexual inclinations that they can have marriage like hetero­sexual couples is basically to “hoodwink” them: “Deep down, there is no mystery between two men, ultimately.“

This striking insight helps bring into focus the authentic and remarkable mystery we encounter in the joining of husband and wife in marriage. That abiding mystery touches on their one flesh union and reveals an inner fruitfulness, enabling them to contribute to­gether something greater than either can do alone, namely, the engen­dering of new life in the marital embrace. Ultimately, that life-giving mystery flows from their radical male–female complementarity.

Pope John Paul II commented on this “mystery of complementar­ity” when he noted how "uniting with each other [in the conjugal act] so closely as to become ‘one flesh,’ man and woman, rediscover, so to speak, every time and in a special way, the mystery of creation."

The personal and bodily complementarity of man and woman, along with the “duality of a mysterious mutual attraction,” reminds us, again in the words of the Pope, how “femininity finds itself, in a sense, in the presence of masculinity, while masculinity is confirmed through femininity.”

In recent times, nevertheless, the importance of the bodily and spiritual complementarity of man and woman has come to be di­minished and even negated in the minds of many, largely due to the diffusion of contraception. This way of intentionally impeding our own procreativity has effectively diminished and even undermined our ability to perceive the inner order and interpersonal meaning of our own sexuality. Pope John Paul II once described the root truth about human sexuality as that “characteristic of man — male and female —which permits them, when they become ‘one flesh,’ to submit at the same time their whole humanity to the blessing of fertility.”

The routine promotion of contraceptive sexual relations across all strata of society has effectively collapsed the mystery of sexuality into the trivial pursuit of mutually-agreed-upon pleasur­able sensations. It has man­aged to reconfigure that sexuality into, basi­cally, sterile acts of mutual auto-eroti­cism. Men and women, neutered and neutralized by various surgeries, pharmaceuticals, or other devices, no longer really need each other in their complementary sexual roles, with homosexual genital activ­ity claiming the status of just another variant of the same game. This de­pleted vision of our sexuality strips out the beauti­ful mystery at its core and diminishes our human dignity.

Human sexuality clearly touches deep human chords, including the reality of our solitude. In the depths of the human heart is found a desire for completion through the total spousal gift of oneself to another, a gift that profoundly contributes to alleviating our primordial sense of human solitude. Both Pope John Paul II and Pope Francis have noted how the deeper mystery of communion that we seek through intimacy is con­nected to this desire to overcome solitude. We are ultimately intended for communion, so our experiences of human solitude draw us into rela­tionship, and beckon us to an en­counter with the other.

Yet the union of friendship that arises between two men, for example, or between two women, while clearly important in helping to overcome solitude, can be predicated only on non-genital forms of sharing if their friendship is to be authentic, fruitful and spiritually life-giving. Genital sexual activity between members of the same sex fails to communicate objectively either the gift of life or the gift of self. Such activity counter­mands authentic intimacy by col­lapsing into a form of consensual bodily exploitation, contradicting the very design and meaning of the body in its nature as masculine or feminine. It represents, in fact, the lifeless an­tithesis of nuptial fruitfulness and faithfulness.

The beauty and meaning of every sexual encounter in marriage, then, is rooted not only in faithful and exclusive love, but also in the radical complementarity of spouses manifested in the abiding mystery of their mutual procreativity. Pope Francis, speaking at the 2015 Synod of Bishops and addressing the theme of The Vocation and Mission of the Fam­ily in the Church and in the Contemporary World, reiterated this divine design over human sexuality when he stressed: “This is God’s dream for his beloved creation: to see it fulfilled in the loving union between a man and a woman, rejoicing in their shared journey, fruitful in their mutual gift of self.”

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