There is a modern argument for conjugal contraception which claims to speak in personalist terms, and which could be summarised as follows. The marriage act has two functions: a biological or procreative function, and a spiritual-unitive function. However, while it is only potentially a procreative act, it is actually and in itself a love act: it truly expresses conjugal love and unites husband and wife. Now, while contraception frustrates the biological or procreative potential of the marital act, it fully respects its spiritual and unitive function; in fact it facilitates it by removing tensions or fears capable of impairing the expression of love in married intercourse. In other words - this position claims - while contraception suspends or nullifies the procreative aspect of marital intercourse, it leaves its unitive aspect intact.
Until quite recently, the argument presented by christian moralists against artificial birth-control has mainly been that the sexual act is naturally designed for procreation, and it is wrong to frustrate this design because it is wrong to interfere with man's natural functions. Many persons are not altogether convinced by this argument, which does seem open to rather elementary objections. After all, we do interfere with other natural functions, for instance when we use ear-plugs or hold our nose, etc., and no one has ever argued that to do so is morally wrong. Why then should it be wrong to interfere for good reasons with the procreational aspect of marital intercourse? The defenders of contraception in any case, dismiss this traditional argument as mere "biologism"; as an understanding of the marital act that fails to go beyond its biological function or possible biological consequences, and ignores its spiritual function, i.e. its function in signifying and effecting the union of the spouses.
Those who advance this defence of marital contraception - couched in apparently personalist terms - feel they are on strong and positive ground. If we are to offer an effective answer and show the radical defectiveness of this position, I suggest that we too need to develop a personalist argument, based on a true personalist understanding of sex and marriage.
The contraceptive argument outlined is evidently built on an essential thesis: that the procreative and the unitive aspects of the marital act are separable, i.e. that the procreative aspect can be nullified without this in any way vitiating the conjugal act or making it less a unique expression of true marital love and union.
This thesis is of course explicitly rejected by the Church. The main reason why contraception is unacceptable to a christian conscience is, as Pope Paul VI put it in Humanae Vitae, the "inseparable connection, established by God... between the unitive significance and the procreative significance which are both inherent to the marriage act" (HV 12).
Paul VI affirmed this inseparable connection. He did not however go on to explain why these two aspects of the marital act are in fact so inseparably connected, or why this connection is such that it is the very ground of the moral evaluation of the act. Perhaps serene reflection, matured by the ongoing debate of more than 20 years, can enable us to discover the reasons why this is so: why the connection between the two aspects of the act is in fact such that the destruction of its procreative reference necessarily destroys its unitive and personalist significance. In other words, if one deliberately destroys the power of the conjugal act to give life, one necessarily destroys its power to signify love: the love and union proper to marriage.
The marital act as an act of union
Why is the act of intercourse called the conjugal act? Why is it regarded as the most distinctive expression of marital love and self-giving? Why is this act - which is but a passing and fleeting thing - particularly regarded as an act of union? After all, people in love express their love and desire to be united in many ways: sending letters, exchanging looks or presents, holding hands... What makes the sexual act unique? Why does this act unite the spouses in a way that no other act does? What is it that makes it not just a physical experience but a love experience?
Is it the special pleasure attaching to it? Is the unitive meaning of the conjugal act contained just in the sensation, however intense, that it can produce? If intercourse unites two people simply because it gives special pleasure, then it would seem that one or other of the spouses could at times find a more meaningful union outside marriage than within it. It would follow too that sex without pleasure becomes meaningless, and that sex with pleasure, even homosexual sex, becomes meaningful.
No. The conjugal act may or may not be accompanied by pleasure; but the meaning of the act does not consist in its pleasure. The pleasure provided by marital intercourse may be intense, but it is transient. The significance of marital intercourse is also intense, and it is not transient; it lasts.
Why should the marital act be more significant than any other expression of affection between the spouses? Why should it be a more intense expression of love and union? Surely because of what happens in that marital encounter, which is not just a touch, not a mere sensation, however intense, but a communication, an offer and acceptance, an exchange of something that uniquely represents the gift of oneself and the union of two selves.
Here, of course, it should not be forgotten that while two persons in love want to give themselves to one another, to be united to one another, this desire of theirs remains humanly speaking on a purely volitional level. They can bind themselves to one another, but they cannot actually give themselves. The greatest expression of a person's desire to give himself is to give the seed of himself . Giving one's seed is much more significant, and in particular is much more real, than giving one's heart. "I am yours, I give you my heart; here, take it", remains mere poetry, to which no physical gesture can give true body. But, "I am yours; I give you my seed; here, take it", is not poetry, it is love. It is conjugal love embodied in a unique and privileged physical action whereby intimacy is expressed - "I give you what I give no one" - and union is achieved: "Take what I have to give. This will be a new me. United to you, to what you have to give - to your seed - this will be a new "you-and-me", fruit of our mutual knowledge and love". In human terms, this is the closest one can come to giving one's self conjugally and to accepting the conjugal self-gift of another, and so achieving spousal union.
Therefore, what makes marital intercourse express a unique relationship and union is not the sharing of a sensation but the sharing of a power: of an extraordinary life-related, creative physical sexual power. In a true conjugal relationship, each spouse says to the other: "I accept you as somebody like no one else in my life. You will be unique to me and I to you. You and you alone will be my husband; you alone will be my wife. And the proof of your uniqueness to me is the fact that with you - and with you alone - am I prepared to share this God-given life-oriented power".
In this consists the singular quality of intercourse. Other physical expressions of affection do not go beyond the level of a mere gesture; they remain a symbol of the union desired. But the conjugal act is not a mere symbol. In true marital intercourse, something real has been exchanged, with a full gift and acceptance of conjugal masculinity and femininity. And there remains, as witness to their conjugal relationship and the intimacy of their conjugal union, the husband's seed in the wife's body .
Now if one deliberately nullifies the life-orientation of the conjugal act, one destroys its essential power to signify union. Contraception in fact turns the marital act into self-deception or into a lie: "I love you so much that with you, and with you alone, I am ready to share this most unique power..." But - what unique power? In contraceptive sex, no unique power is being shared, except a power to produce pleasure. But then the uniqueness of the marital act is reduced to pleasure. Its significance is gone.
Contraceptive intercourse is an exercise in meaninglessness. It could perhaps be compared to going through the actions of singing without letting any sound of music pass one's lips.
Some of us can remember the love-duets of Jeanette McDonald and Nelson Eddy, two popular singing stars of the early "talkies". How absurd if they had sung silent duets: going through the motions of singing, but not allowing their vocal chords to produce an intelligible sound: just meaningless reverberations...; a hurry or a flurry of movement signifying nothing. Contraceptive intercourse is very much like that. Contraceptive spouses involve each other in bodily movements, but their "body language" is not truly human (The "language of the body" is of course a key expression in Pope John Paul II's writings on sexuality and marriage). They refuse to let their bodies communicate sexually and intelligibly with one another. They go through the motions of a love-song; but there is no song.
Contraception is in fact not just an action without meaning; it is an action that contradicts the essential meaning which true conjugal intercourse should have as signifying total and unconditional self-donation ("Contraception contradicts the truth of conjugal love", Pope John Paul II, Address, September 17, 1983). Instead of accepting each other totally, contraceptive spouses reject of each other in part, because fertility is part of each of them. They reject part of their mutual love: its power to be fruitful...
A couple may say: we do not want our love to be fruitful. But if that is so, there is an inherent contradiction in their trying to express their love by means of an act which, of its nature, implies fruitful love; and there is even more of a contradiction if, when they engage in the act, they deliberately destroy the fertility-orientation from which precisely derives its capacity to express the uniqueness of their love.
In true marital union, husband and wife are meant to experience the vibration of human vitality in its very source . In the case of contraceptive "union", the spouses experience sensation, but it is drained of real vitality.
The anti-life effect of contraception does not stop at the "No" which it addresses to the possible fruit of love. It tends to take the very life out of love itself. Within the hard logic of contraception, anti-life becomes anti-love. Its devitalising effect devastates love, threatening it with early ageing and premature death.
At this point it is good to anticipate the possible criticism that our argument so far is based on an incomplete disjunction, inasmuch as it seems to affirm that the conjugal act is either procreative or else merely hedonistic... Can contraceptive spouses not counter this with the sincere affirmation that, in their intercourse, they are not merely seeking pleasure; they are also experiencing and expressing love for one another?
Let us clarify our position on this particular point. We are not affirming that contraceptive spouses may not love each other in their intercourse, nor - insofar as they are not prepared to have such intercourse with a third person - that it does not express a certain uniqueness in their relationship. Our thesis is that it does not express conjugal uniqueness. Love may somehow be present in their contraceptive relationship; conjugal love is not expressed by it. Conjugal love may in fact soon find itself threatened by it. Contraceptive spouses are constantly haunted by the suspicion that the act in which they share could indeed be, for each one of them, a privileged giving of pleasure, but could also be a mere selfish taking of pleasure. It is logical that their love-making be troubled by a sense of falseness or hollowness, for they are attempting to found the uniqueness of the spousal relationship on an act of pleasure that tends ultimately to close each one of them sterilely in on himself or herself, and they are refusing to found that relationship on the truly unique conjugal dimension of loving co-creativity capable, in its vitality, of opening each of them out not merely to one another but to the whole of life and creation.
Sexual love and sexual knowledge
The mutual and exclusive self-donation of the marriage act consists in its being the gift and acceptance of something unique. Now this something unique is not just the seed (this indeed could be "biologism"), but the fullness of the sexuality of each spouse.
It was in the context of its not being good for man to be alone that God made him sexual. He created man in a duality - male and female - with the potential to become a trinity. The differences between the sexes speak therefore of a divine plan of complementarity, of self-completion and self-fulfilment, also through self-perpetuation.
It is not good for man to be alone because man, on his own, cannot fulfil himself; he needs others. He especially needs another: a companion, a spouse. Union with a spouse, giving oneself to a spouse - sexual and marital union in self-donation - are normally a condition of human growth and fulfilment.
Marriage, then, is a means of fulfilment through union. Husband and wife are united in mutual knowledge and love, a love which is not just spiritual but also bodily; and a knowledge supporting their love which is likewise not mere speculative or intellectual knowledge; it is bodily knowledge as well. Their marital love is also meant to be based on carnal knowledge; this is fully human and fully logical. How significant it is that the Bible, in the original hebrew, refers to marital intercourse in terms of man and woman "knowing" each other. Adam, Genesis says, knew Eve, his wife. What comment can we make on this equivalence which the Bible draws between conjugal intercourse and mutual knowledge?
What is the distinctive knowledge that husband and wife communicate to one another? It is the knowledge of each other's integral human condition as spouse. Each "discloses" a most intimate secret to the other: the secret of his or her personal sexuality. Each is revealed to the other truly as spouse and comes to know the other in the uniqueness of that spousal self-revelation and self-gift. Each one lets himself or herself be known by the other, and surrenders to the other, precisely as husband or wife.
Nothing can undermine a marriage so much as the refusal to fully know and accept one's spouse or to let oneself be fully known by him or her. Marriage is constantly endangered by the possibility of one spouse holding something back from the other; keeping some knowledge to oneself that he or she does not want the other to possess . This can occur on all levels of interpersonal communication: physical as well as spiritual.
In many modern marriages, there is something in the spouses, and between the spouses, that each does not want to know, does not want to face up to, wants to avoid: and this something is their sexuality. As a result, since they will not allow each other full mutual carnal knowledge, they do not truly know each other sexually or humanly or spousally. This places their married love under a tremendous existential tension that can tear it apart.
In true marital intercourse each spouse renounces protective self-possession, so as to fully possess and be fully possessed by the other. This fullness of true sexual gift and possession is only achieved in marital intercourse open to life. Only in procreative intercourse do the spouses exchange true "knowledge" of one another, do they truly speak humanly and intelligibly to one another; do they truly reveal themselves to one another in their full human actuality and potential. Each offers, and each accepts, full spousal knowledge of the other.
In the body language of intercourse, each spouse utters a word of love that is both a "self-expression" - an image of each one's self - as well as an expression of his or her longing for the other. These two words of love meet, and are fused in one. And, as this new unified word of love takes on flesh, God shapes it into a person - the child: the incarnation of the husband's and wife's sexual knowledge of one another and sexual love for one another.
In contraception, the spouses will not let the word - which their sexuality longs to utter - take flesh. They will not even truly speak the word to each other. They remain humanly impotent in the face of love; sexually dumb and carnally speechless before one another.
Sexual love is a love of the whole male or female person, body and spirit. Love is falsified if body and spirit do not say the same thing. This happens in contraception. The bodily act speaks of a presence of love or of a degree of love that is denied by the spirit. The body says, "I love you totally", whereas the spirit says, "I love you reservedly". The body says, "I seek you"; the spirit says, "I will not accept you, not all of you".
Contraceptive intercourse falls below mere pantomime. It is disfigured body-language; it expresses a rejection of the other. By it, each says: "I do not want to know you as my husband or my wife; I am not prepared to recognise you as my spouse. I want something from you, but not your sexuality; and if I have something to give to you, something I will let you take, it is not my sexuality" .
This enables us to develop a point we touched on earlier. The negation that a contraceptive couple are involved in is not directed just towards children, or just towards life, or just towards the world. They address a negation directly towards one another. "I prefer a sterile you", is equivalent to saying, "I don't want all you offer me. I have calculated the measure of my love, and it is not big enough for that; it is not able to take all of you. I want a "you" cut down to the size of my love..." The fact that both spouses may concur in accepting a cut-rate version of each other does not save their love or their lives - or their possibilities of happiness - from the effects of such radical human and sexual devaluation.
Normal conjugal intercourse fully asserts masculinity and femininity. The man asserts himself as man and husband, and the woman equally asserts herself as woman and wife. In contraceptive intercourse, only a maimed sexuality is asserted. In the truest sense sexuality is not asserted at all. Contraception represents such a refusal to let oneself be known that it simply is not real carnal knowledge. A deep human truth underlies the theological and juridic principle that contraceptive sex does not consummate marriage.
Contraceptive intercourse, then, is not real sexual intercourse at all. That is why the disjunctives offered by this whole matter are insufficiently expressed by saying that if intercourse is contraceptive, then it is merely hedonistic. This may or may not be true. What is true - at a much deeper level - is that if intercourse is contraceptive, then it is not sexual. In contraception there is an "intercourse" of sensation, but no real sexual knowledge or sexual love, no true sexual revelation of self or sexual communication of self or sexual gift of self. The choice of contraception is in fact the rejection of sexuality. The warping of the sexual instinct from which modern society seems to suffer represents not so much an excess of sex, as a lack of true human sexuality.
True conjugal intercourse unites. Contraception separates, and the separation works right along the line. It not only separates sex from procreation, it also separates sex from love. It separates pleasure from meaning, and body from mind. Ultimately and surely, it separates wife from husband and husband from wife.
Contraceptive couples who stop to reflect realize that their marriage is troubled by some deep malaise. The alienations they are experiencing are a sign as well as a consequence of the grave violation of the moral order involved in contraception. Only a resolute effort to break with contraceptive practices can heal the sickness affecting their married life. This is why the teaching of Humanae Vitae as well as subsequent papal magisterium on the matter, far from being a blind adherence to an outdated posture, represent a totally clear-sighted defence of the innate dignity and true meaning of human and spousal sexuality.
Why does only procreative sex fulfill?
Our argument so far is that contraceptive marital sex does not achieve any true personalist end. It does not bring about self-fulfilment in marriage, but rather prevents and frustrates it. But - one may still ask - does it follow that open-to-life marital sex alone leads to the self-fulfilment of the spouses? I think it does; and the reason lies in the very nature of love (cf. Covenanted Happiness, pp. 38-47). Love is creative. God's love (if we may put it this way) "drove" Him to create. Man's love, made in the image of God's, is also meant to create. If it deliberately does not do so, it frustrates itself. Love between two persons makes them want to do things together. While this is true of friendship in general, it has a singular application to the love between spouses. A couple truly in love want to do things together; if possible, they want to do something "original" together. Nothing is more original to a couple in love than their child: the image and fruit of their love and their union. That is why "the marital thing" is to have children; and other things, as substitutes, do not satisfy conjugal love.
Procreative intercourse fulfills also because only in such intercourse are the spouses open to all the possibilities of their mutual love: ready to be enriched and fulfilled not only by what it offers to them, but also by what it demands of them.
Further, procreative 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.
The vitality of sensation in sexual intercourse should correspond to a vitality of meaning (remembering - as we have said - that sensation is not meaning). The very explosiveness of sexual pleasure suggests the greatness of the creativity of sex. In each conjugal act, there should be something of the magnificence - of the scope and power - of Michelangelo's Creation in the Sistine Chapel in Rome... But it is the dynamism not just of a sensation, but of an event: of something that happens, of a communication of life.
A lack of true sexual awareness characterizes the act if the intensity of pleasure does not serve to stir a fully conscious understanding of the greatness of the conjugal experience: I am committing myself - my creative life-giving power - not just to another person, but to the whole of creation: to history, to mankind, to the purposes and design of God. In each act of conjugal union, teaches Pope John Paul II, "there is renewed, in a way, the mystery of creation in all its original depth and vital power" (General Audience, November 21, 1979: Insegnamenti di Giovanni Paolo II, II, 2 (1979), p. 1215).
A last point should be made. The whole question we are considering is of course tremendously complicated precisely by the strength of the sexual instinct. Nevertheless, the very strength of this instinct should itself be a pointer towards an adequate understanding of sexuality. Elementary commonsense says that the power of the sexual urge must correspond to deep human aspirations or needs. It has of course been traditional to explain the sexual urge in cosmic or demographic terms: just as we have a food appetite to maintain the life of the individual, so we have a sex appetite to maintain the life of the species. This explanation makes sense - as far as it goes. However, it clearly does not go far enough. The sex appetite - the strength of the sex appetite - surely corresponds not only to cosmic or collectivist needs, but also to personalist needs. If man and woman feel a deep longing for sexual union, it is also because they have - each one personally has - a deep longing for all that is involved in true sexuality: self-giving, self-complementarity, self-realization, self-perpetuation, in spousal union with another.
The experience of such complete spousal sexuality is filled with many-facetted pleasure, in which the simple physical satisfaction of a mere sense instinct is accompanied and enriched by the personalist satisfaction of the much deeper and stronger longings involved in sex, and not marred and soured by their frustration. If continuous and growing sexual frustration is a main consequence of contraception, this is also because the contraceptive mentality deprives the very strength of the sexual urge of its real meaning and purpose, and then tries to find full sexual experience and satisfaction in what is basically little more than a physical release.
 Seed is here intended to refer equally to the male or the female generative element.
 In this way in fact the uniqueness of the decision to marry a particular person is reaffirmed in each marital act. By every single act of true intercourse, each spouse is confirmed in the unique status of being husband or wife to the other.
 This still remains true even in cases where, for some reason or another, the spouses cannot have children. Their union in such cases, just as their union during the wife's pregnancy, draws its deepest meaning from the fact that both their conjugal act and the intention behind it are "open to life", even though no life can actually result from the act. It is their basic openness to life which gives the act its meaning and dignity. Just as the absence of this openness is what undermines the dignity and meaning of the act when the spouses, without serious reasons, deliberately limit their marital intercourse to the infertile periods.
 Obviously we are not referring here to those occasions in which, out of justice to a third party, one of the spouses is under an obligation to observe some secret, e.g. of a professional nature. Fulfilment of such an obligation is in no way a violation of the rights of married intimacy.
 If it is not sexuality that each spouse in contraceptive intercourse gives to or takes from the other, what does each one in fact actually take or give? In what might be termed the better cases, it is a form of love - divorced from sexuality. In other cases, it is merely pleasure, also - be it noted - divorced from sexuality. In one case or the other, contraceptive spouses always deny themselves sexuality. Their marriage, deprived of a true sexual relationship, suffers in consequence.