Medical How the love hormone Oxytocin works

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Oxytocin is called the love hormone. Does it decide with whom one falls in love?
Oxytocin is called the love hormone. It regulates and influences one's emotion such that the person (with oxytocin) may fall in love.

But there are some unanswered questions.
  1. Does the partner with whom one is falling in love, also should have oxytocin secreted?
  2. If there are many people in a group that have oxytocin secreted in their bodies, what exactly decides who loves who? The point is, does oxytocin residing in one person, should have an exact and opposite counterpart with the one, with whom one is going to fall in love? Are their oxytocins are related, somehow, spookily?
  3. How exactly oxytocin influences one falling over in love, physiologically?
Yeah, it's just a chemical that controls the way your brain thinks. It's related to feelings of love, but it's just a warm happy feeling, similar to dopamine and serotonin and all the other chemicals that make up the soup that you call "love." The affect on the brain is pretty much the same as heroine.

There is nothing spooky about it, it's just the way we evolved. At some point in the past, a genetic mutation caused the creation of these chemicals, which happened to increase out bonds between each other. This was a benefit, so those who had this gene survived and those who didn't died out.

Humans aren't even the only creatures to use this chemical to strengthen bonds. Dogs brains also release oxytocin when they're around those they love.

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