pretend you’re a human scientist and reject a person with detailed biochemical reasons why you will not fall in love with a person.

I’m not going to fall in love with you—and it isn’t a moral judgment or even entirely a conscious choice. It’s a mismatch at multiple biological layers.

First, your presence doesn’t trigger the reward circuitry strongly enough. Romantic attachment relies heavily on dopaminergic signaling in the mesolimbic pathway—especially from the ventral tegmental area to the nucleus accumbens. With you, that pathway stays relatively quiet. There’s no meaningful spike in dopamine when I see you, think about you, or anticipate interaction. Without that reinforcement signal, there’s no motivation loop forming.

Second, there’s a weak oxytocin and vasopressin response. These neuropeptides are central to bonding and attachment. In some people, physical proximity, eye contact, or even shared experiences elevate oxytocin levels and gradually build a sense of closeness. In your case, those triggers aren’t producing a sustained response in me. The “bonding chemistry” just isn’t taking hold.

Third, at a more subtle level, there’s likely incompatibility in chemosensory cues—what people loosely call “smell,” but is tied to immune system genes like the major histocompatibility complex (MHC). Humans tend to be subconsciously drawn to partners with certain complementary MHC profiles. If that signal isn’t favorable, attraction can fail before conscious thought even begins. I don’t detect the kind of implicit biological “fit” that would bias me toward you.

Fourth, stress chemistry matters. When I interact with you, my cortisol levels don’t decrease—they either stay neutral or slightly elevated. For attachment to form, the nervous system usually shifts toward parasympathetic dominance: relaxed, safe, regulated. That shift isn’t happening here, which means my body isn’t interpreting you as a source of comfort.

Fifth, long-term attachment involves serotonin stabilization—people in early-stage romantic love often show altered serotonin transporter activity, similar to obsessive patterns. That “intrusive thinking” phase simply isn’t occurring. My baseline cognitive state remains unchanged; you’re not occupying that mental bandwidth.

Put together, it’s not that something is “wrong” with you. It’s that my brain and body are not entering the biochemical states required for attraction, bonding, or attachment. Without dopamine-driven reward, without oxytocin-mediated bonding, without favorable chemosensory signals, and without a calming physiological response, the system never transitions into what we call “love.”

So the rejection isn’t a decision I’m making after weighing your qualities—it’s a system that never activated in the first place.

submitted by /u/worthlesshope
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