1. Introduction
The question of whether romantic love must be exclusive remains one of the most contested issues in contemporary philosophy of love. While it is often approached through sociological or psychological lenses, these fields, for all their insight, can sometimes overlook the deep structures of experience itself. The contemporary philosophical landscape has witnessed renewed interest in this fundamental question, particularly regarding whether exclusivity constitutes an essential or merely contingent feature of deep romantic relationships. This inquiry is not merely academic, it bears directly on how we understand the structure of human intimacy, the moral parameters of romantic commitment, and the metaphysical foundations of love itself.
Recent scholarships have challenged traditional assumptions about monogamy’s necessity [
1] and proposed refined conceptions of conjugal love [
2], yet these contemporary interventions raise profound questions about the relationship between romantic depth and exclusivity that demand engagement with classical philosophical frameworks. I argue that the synthesis of Kantian transcendental idealism, Scheler’s axiological phenomenology, and Schopenhauer’s metaphysics of Will provide compelling grounds for understanding exclusivity as structurally necessary for authentic romantic love. This is not a defense of exclusivity based on social convention or practical considerations, but rather a claim about the fundamental architecture of romantic experience itself.
This argument primarily addresses mutual, reciprocated romantic love embedded in sustained existential commitment (e.g., conjugal or long-term exclusive partnerships), rather than fleeting desire, unrequited longing, or broader forms of emotional intimacy. A reader might rightly question the coherence of a synthesis that draws on both Kant and Scheler, given their well-known philosophical disagreements. Indeed, their ethical projects are famously at odds; Kant grounds morality in the a priori demands of rational duty, while Scheler champions a material ethics grounded in the phenomenology of value. I acknowledge this tension.
However, the argument I am developing here does not attempt to reconcile their entire systems, a task that would be far beyond its scope. Instead, my approach is methodologically specific. I am extracting a particular kind of structural insight from each thinker: from Kant, a claim about the transcendental architecture of cognitive synthesis, and from Scheler, a claim about the phenomenological dynamics of axiological attention. I suggest that these two insights, one concerning how we constitute a unified experience and the other how we disclose profound value, are not mutually exclusive. In fact, they seem to point toward a convergent conclusion about the singular focus required for romantic love, allowing them to function as parallel, mutually reinforcing arguments within the narrow context of this essay.
2. Contemporary Challenges to Romantic Exclusivity
2.1. McKeever’s Non-Monogamous Romantic Depth
Natasha McKeever’s influential work challenges the presumption that romantic love requires sexual exclusivity. In her seminal Journal of Applied Philosophy article, McKeever [
1] argues that while romantic love is often presumed to require sexual exclusivity, this requirement lacks logical necessity. Her position rests on several key claims that merit careful examination.
First, McKeever contends that sexual exclusivity cannot be justified merely by protecting relationships from jealousy or the so-called “trade-up” risking the concern that partners might abandon existing relationships for seemingly superior alternatives [
1] (p. 356). These protective justifications, she argues, treat exclusivity as an instrumental good rather than addressing whether it is intrinsically connected to romantic love’s nature. Second, she suggests that exclusivity may be intelligible only as it supports romantic relationships by distinguishing them from other relationships and enhancing their intrinsic value [
1] (p. 362).
Most significantly, McKeever maintains that romantic love can exist between more than two people—that non-monogamous romantic depth is not only possible but can instantiate genuine romantic love even if monogamy may support certain relational goods [
1] (p. 365). Her doctoral thesis further elaborates that monogamy is compatible with romantic love but not morally superior to non-monogamous arrangements, and that various non-monogamous forms can indeed instantiate romantic love [
3] (pp. 187–203).
More fundamentally, McKeever’s framework presupposes a modular, additive view of intimacy—as if multiple loves can be stacked or parallelized without ontological distortion. This model of romantic experience reduces love to a collection of affective or ethical commitments, each discrete and transferable. Scheler, however, explicitly rejects such psychologism: “Love is not a psychic fact like pleasure or desire, but a movement of the spirit disclosing value” [
4] (p. 157). If so, McKeever’s plural framework commits a category error, it treats a spiritual movement requiring singular intentional depth as though it were a divisible psychological commodity.
2.2. Bennett’s Conjugal Love and Exclusivity
Christopher Bennett [
2] offers a different but related challenge to traditional thinking about romantic exclusivity. Building on Hegelian insights about recognition and intimate relationships, Bennett proposes the notion of conjugal love as a distinct form of deep intimate concern characterized by two essential features that distinguish it from friendship and other forms of care.
First, conjugal love involves concern for the whole of the other’s life in a way that friends do not typically share [
2] (p. 290). This encompasses not merely concern for the beloved’s well-being in specific domains, but a comprehensive investment in their flourishing across all dimensions of existence. Second, and more controversially, Bennett argues that conjugal love possesses an exclusivity of value, it is fundamentally exclusive and demands a unique, singular focus that cannot be replicated or divided [
2] (pp. 294–296).
Bennett’s position differs from McKeever’s in that he insists on exclusivity as definitional of conjugal love, but his justification remains primarily ethical and social rather than metaphysical. He maintains that this exclusivity sets conjugal love apart from friendship and defines the normative ideal of deep relational partnership, but he does not engage with whether this exclusivity reflects deeper structural requirements of romantic experience itself.
While Bennett grounds exclusivity in ethical concern and mutual recognition, this remains on the surface of interpersonal structure. Scheler’s phenomenology digs deeper into value revelation, but it is Schopenhauer who uncovers the metaphysical cost of divided love, [
5] a topic taken up in Essay C. This suggests that both contemporary positions, despite their differences, may be missing deeper philosophical considerations about the nature of romantic love itself.
3. The Kantian–Scheler–Schopenhauer Synthesis
3.1. Essay A: The Transcendental Necessity of Romantic Exclusivity
From a Kantian philosophical standpoint, romantic love presupposes a cognitive unity so complete that exclusivity becomes less a cultural preference and more a structural requirement. If we follow Immanuel Kant’s transcendental idealism, we find that exclusive love appears to be built into the very architecture of coherent romantic experience.
Kant’s
Critique of Pure Reason establishes a foundational principle: all coherent experience depends on the “transcendental unity of apperception.” This is the synthetic activity through which consciousness binds its many representations. The crucial point, as Kant puts it, is that “it must be possible for the ‘I think’ to accompany all my representations”; otherwise, a representation would be “nothing to me” [
6] (B132). This is not just a psychological observation; it is a transcendental necessity. Unity, for Kant, operates as a fundamental category that organizes all possible experience. Without this potential for unified consciousness, we wouldn’t have coherent objects at all, just a chaotic stream of disconnected sensations.
When we love someone romantically, we do not engage with an abstract set of qualities but with a unified person. This person appears to us through our capacity for a unique kind of emotional and cognitive synthesis. The beloved becomes what one might call a “romantic object,” a person who is not merely perceived but is constituted through the lover’s consciousness as a coherent unity of affection, desire, memory, and projection. This constitution process is crucial. Unlike our perception of a tree or a stone, romantic love actively synthesizes not just sensory data but our emotional responses, our shared histories, our imagined futures, and our deepest value judgments into one experiential whole.
The transcendental unity of apperception functions by creating what Kant calls “objective unity,” the binding of representations into coherent objects that can be thought and experienced consistently [
6] (p. 251). For romantic love, this suggests that the synthetic activity constituting the beloved must achieve a complete and singular coherence under one consciousness. The problem with simultaneous romantic loves, then, is not merely practical; it is arguably transcendental. When consciousness attempts to constitute multiple romantic objects at once, it faces what we could call the “synthesis problem.” Each romantic relationship demands its own complete synthetic unity, its own intricate integration of emotion, memory, and value. But the singular “I think” that must ground all experience cannot seem to perform this double synthesis without fragmenting the very unity that makes each relationship intelligible as romantic love.
This suggests that romantic love’s exclusivity is not merely a psychological quirk or social convention but reflects deeper transcendental requirements. Just as the unity of consciousness requires that all my representations be potentially connectible in a single consciousness, authentic romantic love requires that all my romantic representations be unified in a single comprehensive intentional structure directed toward one beloved. The attempt to divide this structure across multiple beloveds would violate the transcendental conditions that make romantic love possible as a coherent form of experience.
Moreover, Kant’s
Groundwork implies that treating another as an “end in themselves” involves the unity of one’s will in moral relation [
7] (p. 429). Dividing one’s romantic will between multiple beloveds’ risks instrumentalization, as each relationship potentially becomes a means to hedonic or self-expressive ends rather than a full moral commitment. Thus, Kantian ethics deepens the transcendental claim: exclusivity is not only a condition of unified experience but a condition of moral authenticity in loving another as a rational agent.
A committed Kantian might, of course, object to this entire line of reasoning. They could rightly argue that the “totalizing integration” I describe is not a form of rational synthesis at all but rather a heteronomous fusion, an emotional dependency on another that stands in direct opposition to the moral autonomy Kant cherishes. This is a serious and valid objection that requires clarification of my project’s scope. My argument is not that Kant himself would have endorsed this form of romantic union as an ethical ideal; he almost certainly would not have. Rather, my claim is a transcendental one about the conditions of possibility for a certain kind of experience we call romantic love. I am applying Kant’s analytic machinery concerning cognitive unity to this phenomenon to see what its structure reveals. The argument is that if when we are to have a coherent, unified experience of another person as a “romantic object” in the totalizing sense described, then the architecture of consciousness itself, as Kant outlines it, seems to impose a requirement of singularity. The claim, therefore, is not about what is ethically autonomous in Kant’s moral system, but about what is cognitively coherent in his transcendental system.
3.2. Essay B: Love as Phenomenological Unity in Scheler’s Ethics
Max Scheler’s phenomenology of emotional life provides crucial insights into why romantic love might require exclusivity. For Scheler, love is fundamentally an intentional act of value revelation that requires deep, concentrated spiritual attention to uncover the beloved’s unique worth. This is not merely a matter of appreciating values that are already manifested, but of actively participating in their disclosure through sustained attentional focus.
Scheler’s approach differs from purely transcendental analysis by focusing on love’s intentional structure and its remarkable role in disclosing value. He argues that “
love… brings about the continuous emergence of ever-higher value in the object… true love opens our spiritual eyes to ever-higher values in the object loved” [
4] (p. 157). This captures something essential about love: it seems to reveal dimensions of worth in the beloved that were previously hidden from view. This process follows what Scheler calls the
ordo amoris, the ordered hierarchy through which love discloses values.
Love does not simply find pre-existing values but actively uncovers new dimensions of worth through sustained attention and emotional engagement. The beloved becomes valuable partly through being loved. This should not be taken to mean that love fabricates value ex nihilo. Rather, Scheler’s position seems to imply a form of co-constitutive disclosure: values are ontologically real, yet many remain concealed or inert unless called forth through the intentional act of loving. In this sense, the beloved’s value is not invented but revealed in depth by the lover’s attunement, a depth that might otherwise remain epistemically inaccessible. One might say that love, for Scheler, is not generative in a constructive sense, but disclosive in a way that makes possible a revelation of value that is both interpersonal and irreducibly singular.
Following Husserl, Scheler understands that consciousness is always consciousness of something. Love, too, possesses this inherent directedness. But Scheler pushes this insight further. Love’s intentionality is not just directed toward an object but toward that object’s unique configuration of values. This suggests what we might call “axiological exclusivity.” The specific constellation of values revealed in loving one person is necessarily unique to that relationship. It emerges from the particular history, dynamic, and emotional resonance between two people and simply cannot be duplicated elsewhere.
When consciousness tries to sustain multiple romantic relationships, it seems to face a fragmentation of its axiological attention. The value-revealing act of love requires what Scheler calls “concentrated spiritual energy” [
4] (pp. 261–265). It seems plausible that distributing this energy across multiple partners would necessarily reduce the depth of value revelation possible in each. Instead of a profound disclosure of worth, we might get what could be termed “surface polyamory”, not as a derogatory term, but to distinguish relationships that lack the singular axiological intensity Scheler associates with value revelation that makes love what it essentially is.
Scheler’s analysis reveals why both McKeever’s and Bennett’s positions encounter difficulties. Against McKeever’s assumption that multiple relationships can achieve equal axiological depth, Scheler’s framework suggests that splitting spiritual energy across multiple beloveds necessarily fragments value-disclosure, resulting in surface-level attachments rather than the transformative romantic depth that defines authentic love. Against Bennett’s position, while he rightly insists on exclusivity for conjugal love, his justification based on concern and lifetime sharing does not engage with whether axiological revelation requires singular focus. Scheler would insist that only one relationship at a time can allow for the levels of depth that define full romantic love in his phenomenological scheme.
3.3. Essay C: The Metaphysical Unity of Will in Schopenhauer’s Analysis
Arthur Schopenhauer’s metaphysical framework provides the deepest level of this synthesis by revealing why exclusivity might be necessary not merely phenomenologically but metaphysically. For Schopenhauer, the Will is singular and indivisible, and authentic romantic love represents its expression through unified, directed striving toward one beloved.
Schopenhauer’s metaphysics provides perhaps the most radical argument for romantic exclusivity. For him, behind the world of appearances lies the Will, a single, indivisible, striving force that constitutes noumenal reality. As he argues, “
The will is one: not numerically, as an individual is one, but as that to which the condition of the possibility of multiplicity… is foreign” [
5] (Vol. 1, §23, p. 113).
This metaphysical unity has profound implications for how we might understand love. If romantic love is a direct expression of the Will manifesting through us, then attempting to divide it across multiple partners creates a kind of metaphysical incoherence. The Will itself, being one, cannot be divided. When our consciousness tries to fragment romantic love, it may no longer be expressing the authentic Will but rather creating what Schopenhauer would see as a phenomenal disintegration. The problem moves beyond fragmented experience to fragmented expression of reality’s core.
In Schopenhauer’s framework, romantic love represents the Will selecting one person as its definitive objectification. This is not a moral command but a metaphysical impulse. The Will, it seems, always strives with singular directionality. To scatter this impulse across multiple beloveds would be to weaken or even falsify its authentic expression. What results, one could argue, are diluted objectifications, mere shadows of love’s true metaphysical core.
This metaphysical insight challenges both contemporary positions in fundamental ways. Against McKeever’s conception of romantic love existing among multiple partners, Schopenhauer would argue that such arrangements amount to phenomenal disintegration, multiple partial objectifications that lack the unified striving that characterizes authentic Will’s expression. Against Bennett’s position, while he insists on exclusivity for conjugal love, his justification operates in ethical and social terms rather than engaging with the underlying metaphysical structure. Schopenhauer reframes exclusivity metaphysically: if one attempts to divide the Will’s expression across multiple beloveds, one necessarily fails to produce authentic love, because the Will cannot will in plural.
4. Synthesis and Contemporary Applications
4.1. Integrating McKeever’s Challenge
When we integrate McKeever’s position through the lens of this philosophical synthesis, we can acknowledge her important insights while revealing their limitations. McKeever is correct that sexual exclusivity per se is not logically necessary for romantic love—the synthesis does not require that romantic love be defined by sexual exclusivity. However, her assumption that romantic love can maintain its essential character across multiple simultaneous relationships encounters serious difficulties.
From the Kantian perspective, such division violates the transcendental unity required for coherent romantic experience. Scheler shows why romantic love requires exclusive axiological attention. But Schopenhauer pushes further, arguing that the Will behind such love is metaphysically indivisible. What appears as psychological or phenomenological fragmentation in Scheler becomes ontological incoherence in Schopenhauer. McKeever’s position might describe emotionally rich, ethically significant relationships, but it is it is unclear whether these relationships can achieve the kind of romantic depth that the philosophical tradition has identified as central to romantic love.
This does not mean that non-monogamous relationships are necessarily inferior or unethical, rather, it suggests that they may represent different forms of intimate relationship that shouldn’t be conflated with romantic love in its fullest philosophical sense. The synthesis reveals that there are structural constraints on romantic love that cannot be overcome through good intentions or careful relationship management.
4.2. Integrating Bennett’s Exclusivity
Bennett’s position aligns more closely with the synthesis, particularly in his insistence on exclusivity as definitional of conjugal love. His criteria of life-concern and exclusive value capture important aspects of what the synthesis reveals about romantic love’s structure. However, his justification remains primarily normative rather than engaging with the deeper structural requirements that make such exclusivity necessary.
The synthesis strengthens Bennett’s position by providing deeper philosophical grounds for exclusivity. It is not merely that conjugal love ought to be exclusive for ethical or social reasons, but that the transcendental, axiological, and metaphysical structure of romantic love requires exclusivity. Bennett’s normative claims about conjugal love become expressions of deeper structural truths about romantic experience itself.
4.3. A Critical Synthesis: Jenkins and Contemporary Alternatives
Of course, this structuralist account is not without powerful critics. Philosophers like Carrie Jenkins offer compelling challenges, arguing that the link between love and exclusivity is a reversible social construct, not a deep necessity. Jenkins posits that our society operates under a set of “scripts” that have narrowly defined romantic love as monogamous and permanent, a phenomenon she calls “amatonormativity” [
8]. She argues that if one sincerely feels romantic love toward multiple people, the problem is not with the feelings but with our restrictive social script. Jenkins develop a dual-nature theory in
What Love is and what it could be [
8], proposing that romantic love is simultaneously a biological phenomenon and social construct [
8] (pp. 10–15).
Jenkins critiques amatonormativity, the assumption that monogamous love is ideal and universal, arguing it unjustly stigmatizes non-monogamous relationships and demands feminist and philosophical resistance [
9].
While Jenkins’ critique of normative constraints is powerful, her framework meets significant challenges when placed in dialogue with the synthesis. The central tension is between social script and ontological structure. From a Schelerian perspective, Jenkins may conflate affective richness with axiological depth. One can certainly feel strong affection for multiple people, but the question Scheler would pose is whether the “concentrated spiritual energy” required for transformative value revelation can be divided without being diluted. Jenkins’ model seems to describe what Scheler might call “surface polyamory” genuine affection spread across partners, but leaving open the question of whether this can achieve love’s deepest, value-revealing potential. Axiological depth comes from sustained, exclusive revelations. Dividing spiritual attention fragments value-disclosure [
4] (p. 157). Plural love loses depth.
From Schopenhauer’s perspective, Jenkins rightly celebrates the freedom to choose one’s relationship structure, but his analysis operates at a deeper, metaphysical level. The question is not whether we can choose to divide our romantic attention, but whether the underlying force of love, the Will, can be authentically fragmented. For Schopenhauer, the Will’s unity is metaphysically prior and cannot be split without distorting love’s essence [
5] (Vol. 1, p. 113). Non-monogamous arrangements, while perhaps valuable in their own terms, would be seen as metaphysically different from the singular, concentrated striving of authentic love.
Jenkins argues that our conceptions of romantic love are structured by social scripts, cultural norms that prescribe who, how, and when to love. But Kant’s transcendental framework suggests that the very possibility of structured romantic experience arises before and beneath any empirical social script. The synthetic unity of apperception is not written by culture, it is It is what makes culture legible in the first place. So, while Jenkins critiques imposed romantic scripts, she may miss that what she calls scripting could in fact be the manifestation of a deeper a priori structure, a structural precondition rather than a contingent overlay
5. Addressing Contemporary Objections
5.1. The Pluralism Objection
A contemporary objection might argue that the synthesis imposes a restrictive philosophical framework on the diversity of human romantic experience. This objection deserves serious consideration, but it may rest on a misunderstanding of what the synthesis claims. The argument is not that all intimate relationships must conform to a single pattern, but that romantic love, when understood in its fullest philosophical sense, has structural requirements that constrain its possible expressions.
The synthesis does not deny the diversity of human intimate experience but rather provides a framework for understanding what distinguishes romantic love from other forms of intimacy. This distinction has both theoretical and practical importance, as it helps us understand what we are we are seeking when we pursue romantic relationships and what kinds of expectations are appropriate to different forms of intimate connection.
5.2. The Empirical Objection
Another objection might point to empirical evidence that some individuals appear to maintain multiple romantic relationships simultaneously without apparent loss of depth or authenticity. This objection raises important questions about the relationship between philosophical analysis and empirical observation, but it assumes that individuals have direct access to the authenticity of their own romantic experiences.
From a Kantian perspective, the transcendental conditions of experience are not directly accessible to empirical observation. From Scheler’s axiological framework, the depth of value revelation is not immediately apparent to consciousness. From Schopenhauer’s metaphysics, the authenticity of Will’s expression is not transparent to phenomenal experience. This suggests that empirical reports of successful non-monogamous romantic relationships, while important, do not necessarily contradict the synthesis’ claims about structural requirements. This does not nullify Jenkins’ insights, it just locates them downstream of transcendental conditions. Her social scripts may describe how culture channels love, but not how love becomes thinkable in the first place.
5.3. The Cultural Relativism Objection
A third objection might argue that the synthesis reflects particular cultural assumptions about romantic love that are not are not universal. However, the synthesis does not necessarily depend on cultural specificity. The Kantian analysis of transcendental conditions, Scheler’s phenomenology of value revelation, and Schopenhauer’s metaphysics of Will all claim to identify universal structures of human experience rather than culturally specific patterns.
5.4. Kierkegaard and Levinas: Extensions of the Framework
Kierkegaard’s analysis of love as a movement of the individual before God aligns with Schopenhauer’s metaphysical singularity. In
Works of Love, he argues that authentic love is marked by infinite inwardness and ethical seriousness, qualities undermined by plural attachments that dilute commitment [
10].
Levinas, in
Totality and Infinity, insists that the Other is encountered in a relation of ethical singularity, irreducible and non-fungible. To divide one’s romantic face-to-face relation among many others would collapse the alterity of each into totality, reducing love to a kind of “ethical simultaneity” incompatible with true responsibility [
11].
Both thinkers, though situated in different traditions, reinforce the synthesis: authentic romantic love presupposes ethical, metaphysical, and existential singularity. To love plurally is not necessarily immoral but it is structurally incompatible with what love is at its highest form
6. Convergence and Conclusions
When taken together, these three philosophical approaches seem to converge on a remarkable conclusion: romantic exclusivity emerges from what appear to be structural requirements operating at multiple levels of human experience. The
Table 1 below outlines these three frameworks and explains why the concept of “romantic love” as a multiplicity falls short.
This reframes the entire debate. While the language of “what we mean by love” gestures toward conceptual clarification, the deeper claim is ontological. The argument advanced here is not simply that exclusivity is a common or culturally dominant feature of love, but that it may be a structural precondition for love’s fullest realization. If romantic love, as understood through the Kantian, Schelerian, and Schopenhauerian frameworks, requires a singular unification of cognitive, axiological, and volitional focus, then exclusivity is not just one feature among others. It becomes the condition under which the phenomenon of romantic love, in its deepest and most coherent form, can take place. This is not to deny that other relational forms may have their own depth or meaning, but it is to suggest that they instantiate a different mode of intimacy, one not structurally equipped to generate the full synthesis described in the preceding analysis.
The synthesis suggests that exclusivity in romantic love is not a limitation to be overcome but a structural requirement that reflects the nature of romantic experience itself. This does not diminish the value of other forms of intimate relationships, but it does suggest that romantic love, when understood in its fullest philosophical sense, has requirements that constrain its possible expressions.
This is not to question the ethical legitimacy or emotional sincerity of those relationships. Rather, it draws a distinction between what may be ethically valid and what possesses ontological coherence within a specific philosophical model of romantic love. In this view, such arrangements, while emotionally meaningful--may reflect what Kant might call “distributed affection,” what Scheler could describe as relational connection without ultimate axiological depth, or what Schopenhauer might regard as enriching but metaphysically diffuse “aesthetic multiplicities.”
This raises a final, unsettling possibility. The pull toward romantic exclusivity that so many humans have felt across cultures and centuries might not be mere social conditioning. It could be an intuitive recognition of something built into the very nature of consciousness and love itself. If these analyses hold, then our deepest emotional experiences are not simply malleable preferences, but may reflect structural features of our being, a possibility that contemporary discussions of love cannot afford to ignore.
The enduring relevance of this synthesis lies not in its ability to provide simple answers to complex questions about intimate relationships, but in its capacity to illuminate the deeper structures that make romantic love possible as a distinctive form of human experience. In a cultural moment that often emphasizes choice and flexibility in relationship structures, the synthesis reminds us that some aspects of human experience operate according to constraints that reflect the nature of that experience itself. Understanding these constraints does not limit our freedom but rather helps us understand what we are we are seeking when we pursue the deepest forms of intimate connection.