The science behind falling in love: Why does it happen?

Look, most people will see this and assume it’s just another endless loop of "what is love" or "finding purpose," but it isn't.
On forums—and unfortunately, even within mainstream psychology—you can find an infinite number of threads about falling in love where everyone just drifts into these vague, philosophical, romanticized tangents.
I’m begging the moderators: please don't move this thread over to Psychology, Social Sciences, or heaven forbid, Philosophy.

Since I haven't been able to dig up much substance online, I want to know: what actually triggers falling in love? How does it manifest, how does it break down, etc.?
I'm talking about all those wonderful—and less wonderful—chemical reactions and everything else.
I'm looking for more than the standard "it's just brain chemistry" answer.

Thanks.
The floor is yours.🙏

Oxytocin is nothing more than nature's way of sugar-coating the bitter pill of reproduction, as someone brilliant once noted: 🙏

Can a mod move this thread over to the Psychology section? It feels like everyone here has either lost interest or just doesn't have a clue about the subject anymore. Thanks.😁😉

Before they head out, one quick video. 🙂

Heh, we’re really descending into the primal depths now, aren't we?

I have always maintained that being "in love" is little more than a temporary hormonal malfunction. It essentially hijacks your cognitive faculties and narrows your field of vision to a singular point. In the grand scheme of things, it serves no purpose other than facilitating reproduction.

I remember stumbling upon some theory a while back—I honestly can’t recall if it holds any water or if it was just internet pseudo-science... but here it is: 🙂

The gist of it is that our brains are constantly scanning everyone around us based on physical appearance—completely subconsciously, of course. Apparently, there's this biological drive where we seek out someone whose traits are the polar opposite of our own—both physically and psychologically—essentially aiming to create the most "optimized" offspring possible 😁. And, if my memory serves me right, the very first thing the brain registers is skin tone; it uses complexion as a sort of visual shorthand to gauge how healthy a person actually is 😲. According to that researcher 😁, that's the absolute baseline requirement. When you step back and look at it, there's a certain cold logic to it, isn't there? 🙂 Though, I have to admit, I'd love to hear a real expert weigh in on this stuff. I tried digging for more data online, but everything felt a bit thin, so I eventually just gave up on the rabbit hole 🤷

steelsurfer42 said:Before they head out, one quick video. 🙂

Hold on. If we’re supposedly falling for someone based on their "scent," why doesn't everyone just fall head over heels the second they meet? Why does it take some people time to get there?

Eric Robinson25 said:I remember stumbling upon some theory a while back—I honestly can’t recall if it holds any water or if it was just internet pseudo-science... but here it is: 🙂

The gist of it is that our brains are constantly scanning everyone around us based on physical appearance—completely subconsciously, of course. Apparently, there's this biological drive where we seek out someone whose traits are the polar opposite of our own—both physically and psychologically—essentially aiming to create the most "optimized" offspring possible 😁. And, if my memory serves me right, the very first thing the brain registers is skin tone; it uses complexion as a sort of visual shorthand to gauge how healthy a person actually is 😲. According to that researcher 😁, that's the absolute baseline requirement. When you step back and look at it, there's a certain cold logic to it, isn't there? 🙂 Though, I have to admit, I'd love to hear a real expert weigh in on this stuff. I tried digging for more data online, but everything felt a bit thin, so I eventually just gave up on the rabbit hole 🤷

So, if this is true, the old cliché actually stands:
Opposites attract!😁

Look, it’s not like we fall head over heels just because our oxytocin levels spike; that stuff is more about building actual intimacy and staying attached once things get serious. And pheromones? They might get someone to notice you, sure, but they aren't the reason you actually fall in love.

I mean, you really can't reduce every single complex psychological thing happening in a person's head down to some simple ratio of hormones. Falling in love is way more complicated than that—it's heavily shaped by the culture we grow up in.

I would kindly ask that whenever you attempt to venture into any sort of philosophical discourse, you bypass this particular thread, given that everything has been quite thoroughly laid out in the opening post
And yes, if one could actually provide a purely physical explanation for love, then understanding the mechanics of falling in love would be a piece of cake

Raymond Sanchez7 said:I would kindly ask that whenever you attempt to venture into any sort of philosophical discourse, you bypass this particular thread, given that everything has been quite thoroughly laid out in the opening post
And yes, if one could actually provide a purely physical explanation for love, then understanding the mechanics of falling in love would be a piece of cake

Are you actually telling me that?
This isn't even philosophy, man—it’s psychology. And trust me, biology isn't the only way to look at psychology, you know? 😉

I mean, I get that she’s only interested in that one angle. But honestly, trying to understand someone like that by looking at one narrow lens is like trying to explain what whiskey is by only talking about its chemical composition.🤷

No, I was referring to that lady positioned directly above you...🙄
If I were to suggest that you were being called out—and I suspect I am quite certain that you were—I believe I would be correct in assuming the remark was directed squarely at you... yes... hm... indeed.
Inače, ako ona hoće znati samo kemijski sastav, strogo znanstveno što je i naglasila i to DEBELO gore, daj molim te, budi pristojna i ljubazna, pa ono otvori svoju temu, daj odgovor koji traži ili pod tri: otiđi s teme na jednu gotovo identičnu niže

Raymond Sanchez7 said:No, I was referring to that lady positioned directly above you...🙄
If I were to suggest that you were being called out—and I suspect I am quite certain that you were—I believe I would be correct in assuming the remark was directed squarely at you... yes... hm... indeed.
Inače, ako ona hoće znati samo kemijski sastav, strogo znanstveno što je i naglasila i to DEBELO gore, daj molim te, budi pristojna i ljubazna, pa ono otvori svoju temu, daj odgovor koji traži ili pod tri: otiđi s teme na jednu gotovo identičnu niže

But you didn't even quote me🤣

And honestly, just asking for the chemical composition isn't "strictly science," because providing half an explanation is basically just being misleading🤷

It’s a heavy, complicated question for any field of science, let alone psychology, but there's probably a grain of truth in everyone's take here.
Studying love scientifically is a nightmare because there isn't even a consensus on what behaviors or feelings actually define it; you can't really measure something that has no fixed definition. Plus, you have to look at it from so many angles—from neurobiology and individual behavior down to how it functions for the species as a whole.

Take falling in love, for instance. That's just one slice of the pie, and even that is messy. It's that feeling where you're obsessed with someone and everything they do seems perfect. Researchers point to phenylethylamine (PEA) as the main driver there. You've also got serotonin shifting your mood, dopamine flagging a potential reward, and norepinephrine pushing you to act. There's likely more going on under the hood, too. But PEA doesn't last forever—maybe 18 months to three years—at which point other hormones like oxytocin and vasopressin kick in to handle the long-term commitment side of things.

From an evolutionary standpoint, love serves a purpose: it signals commitment, which is basically a way to ensure a stable environment for raising offspring.

You could write entire libraries on this subject...😛

Is the shelf life of love just a byproduct of our hormones?

Eric Robinson25 said:I remember stumbling upon some theory a while back—I honestly can’t recall if it holds any water or if it was just internet pseudo-science... but here it is: 🙂

The gist of it is that our brains are constantly scanning everyone around us based on physical appearance—completely subconsciously, of course. Apparently, there's this biological drive where we seek out someone whose traits are the polar opposite of our own—both physically and psychologically—essentially aiming to create the most "optimized" offspring possible 😁. And, if my memory serves me right, the very first thing the brain registers is skin tone; it uses complexion as a sort of visual shorthand to gauge how healthy a person actually is 😲. According to that researcher 😁, that's the absolute baseline requirement. When you step back and look at it, there's a certain cold logic to it, isn't there? 🙂 Though, I have to admit, I'd love to hear a real expert weigh in on this stuff. I tried digging for more data online, but everything felt a bit thin, so I eventually just gave up on the rabbit hole 🤷

Sometimes just one passing glance is enough to decide if someone is physically attractive, which pretty much dictates whether you're interested in sleeping with them or not.

Eric Robinson25 said:I remember stumbling upon some theory a while back—I honestly can’t recall if it holds any water or if it was just internet pseudo-science... but here it is: 🙂

The gist of it is that our brains are constantly scanning everyone around us based on physical appearance—completely subconsciously, of course. Apparently, there's this biological drive where we seek out someone whose traits are the polar opposite of our own—both physically and psychologically—essentially aiming to create the most "optimized" offspring possible 😁. And, if my memory serves me right, the very first thing the brain registers is skin tone; it uses complexion as a sort of visual shorthand to gauge how healthy a person actually is 😲. According to that researcher 😁, that's the absolute baseline requirement. When you step back and look at it, there's a certain cold logic to it, isn't there? 🙂 Though, I have to admit, I'd love to hear a real expert weigh in on this stuff. I tried digging for more data online, but everything felt a bit thin, so I eventually just gave up on the rabbit hole 🤷

There are plenty of indicators; clear, healthy skin signals vitality, while facial symmetry suggests developmental stability and overall biological quality. For instance, one study found that more symmetrical women have about 28% higher estradiol levels mid-cycle compared to less symmetrical ones—and since hormone levels correlate with fertility, symmetry might basically be a proxy for reproductive potential. Another classic marker is the waist-to-hip ratio, where a .70 ratio has consistently been rated as most attractive by men across various cultures.

At the end of the day, though, we shouldn't ignore the philosophical, aesthetic, or poetic sides of love and infatuation. It’s all just one complex phenomenon that can be viewed through endless different lenses, each offering its own piece of the puzzle.

Carl Anderson76 said:Is the shelf life of love just a byproduct of our hormones?

Not necessarily, though hormones definitely play their part. It’s this messy web of environment, biochemistry, consciousness, and perception—everything influencing everything else in a constant loop. Honestly, it's probably too complicated to untangle these days.

wiredmoose6 said:Look, most people will see this and assume it’s just another endless loop of "what is love" or "finding purpose," but it isn't.
On forums—and unfortunately, even within mainstream psychology—you can find an infinite number of threads about falling in love where everyone just drifts into these vague, philosophical, romanticized tangents.
I’m begging the moderators: please don't move this thread over to Psychology, Social Sciences, or heaven forbid, Philosophy.

Since I haven't been able to dig up much substance online, I want to know: what actually triggers falling in love? How does it manifest, how does it break down, etc.?
I'm talking about all those wonderful—and less wonderful—chemical reactions and everything else.
I'm looking for more than the standard "it's just brain chemistry" answer.

Thanks.
The floor is yours.🙏

The reasoning behind my perspective is quite straightforward, if one takes a moment to consider it: it simply isn't healthy or sustainable to spend one's entire existence living under the same roof as one's parents, siblings, grandparents, and the rest of the extended kin lucky enough to be nearby./
rather, it is a fundamental, almost primal instinct to depart from that original childhood home in order to establish one's own distinct tribal unit, which we commonly refer to as a family.

Is it actually possible for someone to simply have no desire to fall in love? I mean, could a person consciously choose to ignore or even pretend they don't notice those physical tells when they're reacting to someone else?