The Science of Love Part 1: Seeking, Lust, and Play
What drives you to reach for another person?
Can I be blunt and say, it's not the poetry of it. It's the machinery underneath it.
Neurobiology has been asking this question for decades, and it answers in a way that can feel almost unromantic at first. Panksepp, a neuroscientist who spent his career studying the brains of social mammals, identified seven primary-process emotional systems that sit underneath thought, underneath language, underneath the stories we tell ourselves about why we love who we love. He called them SEEKING, LUST, CARING, ANGER, FEAR, PLAY, GRIEF. Every one of them fires in you before you have decided anything.
You don't seek out air. Air is already there, filling your lungs without asking. But take it away, and suddenly you are all seeking, all body, all urgency. Love works the same way. We don't seek what we already have. We seek connection precisely at the point where we feel its absence.
So what do you notice yourself seeking, and when?
Seeking
The SEEKING system is the restless one. It is not really about any single thing, it is about the search itself. Dopamine drives it, rewarding you not when you catch what you are after but while you are still in the chase. This is why falling in love can feel like a drug, and why, biologically, it very nearly is. Left to its own devices, the seeking system will chase indefinitely. Harnessed, it becomes the engine behind playfulness, creativity, and the ongoing work of loving someone rather than just having loved them once.
Lust
Then there is LUST, which Panksepp separates cleanly from bonding, even though the two systems borrow each other's chemistry. Oxytocin and vasopressin do double duty here, promoting sexual readiness and trust in one context, care and attachment in another. The American Psychological Association has described oxytocin as having two faces (APA Monitor, 2008): it rewards connection and physiological calm when a bond feels safe, but it can just as easily heighten defensiveness and in-group protectiveness when that bond feels threatened, to make you fight for it. Love is not a single soft chemical. It is a system that can turn combustible and sometimes ugly, the moment it senses threat.
Now this is part that gets interesting...We are always learning from our experience. When our sensuality and sexuality gets hijacked by experiences of coping with FEAR or ANGER, submission or domination can enter the space where vitality and intimacy should be. Ask yourself honestly: when your relationship gets difficult, do you reach for connection, or do you brace for a fight nobody has started? Or do your relationship turns into a power play to avoid feeling vulnerable?
Play
Of all seven systems, PLAY might be the one that adult life trains out of us the fastest. Humans are one of the few mammals who keep the capacity to play into adulthood, and yet how many of us actually use it? Play generates joy that requires nothing else to justify itself. It is curiosity without an agenda, learning about each other without a task attached. Couples who stop playing rarely notice. Mundanity and routine takes over and play just goes quiet. Doing life together might get a little more efficient, but a little less alive.
When did you last do something with someone you love that had no point except that it was fun?
None of these systems asked your permission before they started running. But you get to decide what you build on top of them. Seeking can chase routine and control, or it can chase novelty and depth. Lust can defend or connect. Play can be the first thing that is cut from a busy week, or the joy that keeps the week from hollowing you out.
Loving well starts with knowing what is actually driving you.
Author: Tien Kuei 2026
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