Euphoria serves an evolutionary purpose. It’s to motivate you to do certain things. For humans, it generally is designed to reward you for eating certain foods, being productive in certain weather (you generally get euphoria when the sun comes out after a prolonged period of rain) and most importantly; having sex.
If you were always in a state of euphoria, you would have no motivation to do any of these things. You would simply sit around in a state of total bliss until you starved to death or got mauled by a saber-toothed tiger and the human race would be extinct.
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